function setOptionSystem(form, index) 
{
	for (var i = 0; i < form.system.length; i++) 
	{
		form.system.options[i].text = "";
		form.system.options[i].value = "";
	}
	if (form.era.options[form.era.selectedIndex].value == "Mesozoic")
	{
		form.system.options[0].text = "System";
		form.system.options[0].value = "";
		form.system.options[1].text = "Cretaceous";
		form.system.options[1].value = "Cretaceous";
		form.system.options[2].text = "Triassic";
		form.system.options[2].value = "Triassic";
		form.system.options[3].text = "Jurassic";
		form.system.options[3].value = "Jurassic";
	}
	if (form.era.options[form.era.selectedIndex].value == "Cenozoic")
	{
		form.system.options[0].text = "System";
		form.system.options[0].value = "";
		form.system.options[1].text = "Quaternary";
		form.system.options[1].value = "Quaternary";
		form.system.options[2].text = "Neogene";
		form.system.options[2].value = "Neogene";
		form.system.options[3].text = "Paleogene";
		form.system.options[3].value = "Paleogene";
	}
	if (form.era.options[form.era.selectedIndex].value == "Paleozoic")
	{
		form.system.options[0].text = "System";
		form.system.options[0].value = "";
		form.system.options[1].text = "Permian";
		form.system.options[1].value = "Permian";
		form.system.options[2].text = "Carbonifirous";
		form.system.options[2].value = "Carbonifirous";
		form.system.options[3].text = "Devonian";
		form.system.options[3].value = "Devonian";
		form.system.options[4].text = "Silurian";
		form.system.options[4].value = "Silurian";
		form.system.options[5].text = "Ordovician";
		form.system.options[5].value = "Ordovician";
		form.system.options[6].text = "Cambrian";
		form.system.options[6].value = "Cambrian";
	}
	if (form.era.options[form.era.selectedIndex].value == "Neoproterozoic")
	{
		form.system.options[0].text = "System";
		form.system.options[0].value = "";
		form.system.options[1].text = "Neoproterozoic III";
		form.system.options[1].value = "Neoproterozoic III";
		form.system.options[2].text = "Cryogenian";
		form.system.options[2].value = "Cryogenian";
		form.system.options[3].text = "Tonian";
		form.system.options[3].value = "Tonian";
	}
	if (form.era.options[form.era.selectedIndex].value == "Mesoproterozoic")
	{
		form.system.options[0].text = "System";
		form.system.options[0].value = "";
		form.system.options[1].text = "Stenian";
		form.system.options[1].value = "Stenian";
		form.system.options[2].text = "Ectasian";
		form.system.options[2].value = "Ectasian";
		form.system.options[3].text = "Calymmian";
		form.system.options[3].value = "Calymmian";
	}
	if (form.era.options[form.era.selectedIndex].value == "Paleoproterozoic")
	{
		form.system.options[0].text = "System";
		form.system.options[0].value = "";
		form.system.options[1].text = "Statherian";
		form.system.options[1].value = "Statherian";
		form.system.options[2].text = "Orosirian";
		form.system.options[2].value = "Orosirian";
		form.system.options[3].text = "Rhyacian";
		form.system.options[3].value = "Rhyacian";
		form.system.options[4].text = "Siderian";
		form.system.options[4].value = "Siderian";
	}
	if (form.era.options[form.era.selectedIndex].value == "Neoarchean")
	{
		form.system.options[0].text = "No Systems";
		form.system.options[0].value = "";
		form.series.options[0].text = "No Series";
		form.series.options[0].value = "";
		form.stage.options[0].text = "No Stage";
		form.stage.options[0].value = "";
	}
	if (form.era.options[form.era.selectedIndex].value == "Mesoarchean")
	{
		form.system.options[0].text = "No Systems";
		form.system.options[0].value = "";
		form.series.options[0].text = "No Series";
		form.series.options[0].value = "";
		form.stage.options[0].text = "No Stage";
		form.stage.options[0].value = "";
	}
	if (form.era.options[form.era.selectedIndex].value == "Paleoarchean")
	{
		form.system.options[0].text = "No Systems";
		form.system.options[0].value = "";
		form.series.options[0].text = "No Series";
		form.series.options[0].value = "";
		form.stage.options[0].text = "No Stage";
		form.stage.options[0].value = "";
	}
	if (form.era.options[form.era.selectedIndex].value == "Eoarchean")
	{
		form.system.options[0].text = "No Systems";
		form.system.options[0].value = "";
		form.series.options[0].text = "No Series";
		form.series.options[0].value = "";
		form.stage.options[0].text = "No Stage";
		form.stage.options[0].value = "";
	}
	form.system.selectedIndex = 0;
}

function setOptionSeries(form, index)
{
	for (var i = 0; i < form.series.length; i++) 
	{
		form.series.options[i].text = "";
		form.series.options[i].value = "";
	}
	if (form.era.options[form.era.selectedIndex].value == "Mesozoic")
	{
		if (form.system.options[form.system.selectedIndex].value == "Cretaceous")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Upper/Late";
			form.series.options[1].value = "Upper/Late";
			form.series.options[2].text = "Lower/Early";
			form.series.options[2].value = "Lower/Early";
		}
		if (form.system.options[form.system.selectedIndex].value == "Triassic")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Upper/Late";
			form.series.options[1].value = "Upper/Late";
			form.series.options[2].text = "Middle";
			form.series.options[2].value = "Middle";
			form.series.options[3].text = "Lower/Early";
			form.series.options[3].value = "Lower/Early";
		}
		if (form.system.options[form.system.selectedIndex].value == "Jurassic")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Upper/Late";
			form.series.options[1].value = "Upper/Late";
			form.series.options[2].text = "Middle";
			form.series.options[2].value = "Middle";
			form.series.options[3].text = "Lower/Early";
			form.series.options[3].value = "Lower/Early";
		}
	}
	if (form.era.options[form.era.selectedIndex].value == "Cenozoic")
	{
		if (form.system.options[form.system.selectedIndex].value == "Quaternary")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Holocene";
			form.series.options[1].value = "Holocene";
			form.series.options[2].text = "Pleistocene";
			form.series.options[2].value = "Pleistocene";
		}
		if (form.system.options[form.system.selectedIndex].value == "Neogene")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Pliocene";
			form.series.options[1].value = "Pliocene";
			form.series.options[2].text = "Miocene";
			form.series.options[2].value = "Miocene";
		}
		if (form.system.options[form.system.selectedIndex].value == "Paleogene")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Oligocene";
			form.series.options[1].value = "Oligocene";
			form.series.options[2].text = "Eocene";
			form.series.options[2].value = "Eocene";
			form.series.options[3].text = "Paleocene";
			form.series.options[3].value = "Paleocene";
		}
		
	}
	if (form.era.options[form.era.selectedIndex].value == "Paleozoic")
	{
		if (form.system.options[form.system.selectedIndex].value == "Permian")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Lopingian";
			form.series.options[1].value = "Lopingian";
			form.series.options[2].text = "Guadalupian";
			form.series.options[2].value = "Guadalupian";
			form.series.options[3].text = "Cisuralian";
			form.series.options[3].value = "Cisuralian";
		}
		if (form.system.options[form.system.selectedIndex].value == "Carbonifirous")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Pennsylvanian";
			form.series.options[1].value = "Pennsylvanian";
			form.series.options[2].text = "Mississippian";
			form.series.options[2].value = "Mississippian";
		}
		if (form.system.options[form.system.selectedIndex].value == "Devonian")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Upper/Late";
			form.series.options[1].value = "Upper/Late";
			form.series.options[2].text = "Middle";
			form.series.options[2].value = "Middle";
			form.series.options[3].text = "Lower/Early";
			form.series.options[3].value = "Lower/Early";
		}
		if (form.system.options[form.system.selectedIndex].value == "Silurian")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Pridoli";
			form.series.options[1].value = "Pridoli";
			form.series.options[2].text = "Ludlow";
			form.series.options[2].value = "Ludlow";
			form.series.options[3].text = "Wenlock";
			form.series.options[3].value = "Wenlock";
			form.series.options[4].text = "Llandovery";
			form.series.options[4].value = "Llandovery";
		}
		if (form.system.options[form.system.selectedIndex].value == "Ordovician")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Upper/Late";
			form.series.options[1].value = "Upper/Late";
			form.series.options[2].text = "Middle";
			form.series.options[2].value = "Middle";
			form.series.options[3].text = "Lower/Early";
			form.series.options[3].value = "Lower/Early";
		}	
		if (form.system.options[form.system.selectedIndex].value == "Cambrian")
		{
			form.series.options[0].text = "Series";
			form.series.options[0].value = "";
			form.series.options[1].text = "Upper/Late";
			form.series.options[1].value = "Upper/Late";
			form.series.options[2].text = "Middle";
			form.series.options[2].value = "Middle";
			form.series.options[3].text = "Lower/Early";
			form.series.options[3].value = "Lower/Early";
		}
		
	}
	if (form.era.options[form.era.selectedIndex].value == "Neoproterozoic")
	{
		if (form.system.options[form.system.selectedIndex].value == "Neoproterozoic III")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.system.options[form.system.selectedIndex].value == "Cryogenian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.system.options[form.system.selectedIndex].value == "Tonian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
	}
	if (form.era.options[form.era.selectedIndex].value == "Mesoproterozoic")
	{
		if (form.system.options[form.system.selectedIndex].value == "Stenian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.system.options[form.system.selectedIndex].value == "Ectasian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.system.options[form.system.selectedIndex].value == "Calymmian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
	}
	if (form.era.options[form.era.selectedIndex].value == "Paleoproterozoic")
	{
		if (form.system.options[form.system.selectedIndex].value == "Statherian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.system.options[form.system.selectedIndex].value == "Orosirian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.system.options[form.system.selectedIndex].value == "Rhyacian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.system.options[form.system.selectedIndex].value == "Siderian")
		{
			form.series.options[0].text = "No Series";
			form.series.options[0].value = "";
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
	}
	form.series.selectedIndex = 0;
}

function setOptionStage(form, index)
{
	for (var i = 0; i < form.stage.length; i++) 
	{
		form.stage.options[i].text = "";
		form.stage.options[i].value = "";
	}
	// CENOZOIC
	if (form.system.options[form.system.selectedIndex].value == "Quaternary")
	{
		if (form.series.options[form.series.selectedIndex].value == "Holocene")
		{
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.series.options[form.series.selectedIndex].value == "Pleistocene")
		{
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Neogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pliocene")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Gelasian";
			form.stage.options[1].value = "Gelasian";
			form.stage.options[2].text = "Piacenzian";
			form.stage.options[2].value = "Piacenzian";
			form.stage.options[3].text = "Zanclean";
			form.stage.options[3].value = "Zanclean";
		}
		if (form.series.options[form.series.selectedIndex].value == "Miocene")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Messinian";
			form.stage.options[1].value = "Messinian";
			form.stage.options[2].text = "Tortanian";
			form.stage.options[2].value = "Tortanian";
			form.stage.options[3].text = "Serravallian";
			form.stage.options[3].value = "Serravallian";
			form.stage.options[4].text = "Langhian";
			form.stage.options[4].value = "Langhian";
			form.stage.options[5].text = "Burdigalian";
			form.stage.options[5].value = "Burdigalian";
			form.stage.options[6].text = "Aquitanian";
			form.stage.options[6].value = "Aquitanian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Paleogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Oligocene")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Chattian";
			form.stage.options[1].value = "Chattian";
			form.stage.options[2].text = "Rupelian";
			form.stage.options[2].value = "Rupelian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Eocene")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Priabonian";
			form.stage.options[1].value = "Priabonian";
			form.stage.options[2].text = "Bartonian";
			form.stage.options[2].value = "Bartonian";
			form.stage.options[3].text = "Lutetian";
			form.stage.options[3].value = "Lutetian";
			form.stage.options[4].text = "Ypresian";
			form.stage.options[4].value = "Ypresian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Paleocene")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Thanetian";
			form.stage.options[1].value = "Thanetian";
			form.stage.options[2].text = "Seladian";
			form.stage.options[2].value = "Seladian";
			form.stage.options[3].text = "Danian";
			form.stage.options[3].value = "Danian";
		}
	}
	// MESOZOIC
	if (form.system.options[form.system.selectedIndex].value == "Cretaceous")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Maastrichtian";
			form.stage.options[1].value = "Maastrichtian";
			form.stage.options[2].text = "Campanian";
			form.stage.options[2].value = "Campanian";
			form.stage.options[3].text = "Santonian";
			form.stage.options[3].value = "Santonian";
			form.stage.options[4].text = "Coniacian";
			form.stage.options[4].value = "Coniacian";
			form.stage.options[5].text = "Turonian";
			form.stage.options[5].value = "Turonian";
			form.stage.options[6].text = "Cenomanian";
			form.stage.options[6].value = "Cenomanian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Albian";
			form.stage.options[1].value = "Albian";
			form.stage.options[2].text = "Aptian";
			form.stage.options[2].value = "Aptian";
			form.stage.options[3].text = "Barremian";
			form.stage.options[3].value = "Barremian";
			form.stage.options[4].text = "Hauterivian";
			form.stage.options[4].value = "Hauterivian";
			form.stage.options[5].text = "Valanginian";
			form.stage.options[5].value = "Valanginian";
			form.stage.options[6].text = "Berrasian";
			form.stage.options[6].value = "Berrasian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Jurassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Tithonian";
			form.stage.options[1].value = "Tithonian";
			form.stage.options[2].text = "Kimmeridgian";
			form.stage.options[2].value = "Kimmeridgian";
			form.stage.options[3].text = "Oxfordian";
			form.stage.options[3].value = "Oxfordian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Callovian";
			form.stage.options[1].value = "Callovian";
			form.stage.options[2].text = "Bathonian";
			form.stage.options[2].value = "Bathonian";
			form.stage.options[3].text = "Bajocian";
			form.stage.options[3].value = "Bajocian";
			form.stage.options[4].text = "Aalenian";
			form.stage.options[4].value = "Aalenian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Toarcian";
			form.stage.options[1].value = "Toarcian";
			form.stage.options[2].text = "Pliensbachian";
			form.stage.options[2].value = "Pliensbachian";
			form.stage.options[3].text = "Sinemurian";
			form.stage.options[3].value = "Sinemurian";
			form.stage.options[4].text = "Hettangian";
			form.stage.options[4].value = "Hettangian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Triassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Rhetian";
			form.stage.options[1].value = "Rhetian";
			form.stage.options[2].text = "Norian";
			form.stage.options[2].value = "Norian";
			form.stage.options[3].text = "Carnian";
			form.stage.options[3].value = "Carnian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Ladinian";
			form.stage.options[1].value = "Ladinian";
			form.stage.options[2].text = "Anisian";
			form.stage.options[2].value = "Anisian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Olenekian";
			form.stage.options[1].value = "Olenekian";
			form.stage.options[2].text = "Induan";
			form.stage.options[2].value = "Induan";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Permian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lopingian")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Changhsingian";
			form.stage.options[1].value = "Changhsingian";
			form.stage.options[2].text = "Wuchiapigian";
			form.stage.options[2].value = "Wuchiapigian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Guadalupian")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Capitanian";
			form.stage.options[1].value = "Capitanian";
			form.stage.options[2].text = "Wordian";
			form.stage.options[2].value = "Wordian";
			form.stage.options[3].text = "Roadian";
			form.stage.options[3].value = "Roadian";

		}
		if (form.series.options[form.series.selectedIndex].value == "Cisuralian")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Kungurian";
			form.stage.options[1].value = "Kungurian";
			form.stage.options[2].text = "Artinskian";
			form.stage.options[2].value = "Artinskian";
			form.stage.options[3].text = "Sakmarian";
			form.stage.options[3].value = "Sakmarian";
			form.stage.options[4].text = "Asselian";
			form.stage.options[4].value = "Asselian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Carbonifirous")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pennsylvanian")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Gzhelian";
			form.stage.options[1].value = "Gzhelian";
			form.stage.options[2].text = "Kazimovian";
			form.stage.options[2].value = "Kazimovian";
			form.stage.options[3].text = "Moscovian";
			form.stage.options[3].value = "Moscovian";
			form.stage.options[4].text = "Bashkirian";
			form.stage.options[4].value = "Bashkirian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Mississippian")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Serpukhovian";
			form.stage.options[1].value = "Serpukhovian";
			form.stage.options[2].text = "Visean";
			form.stage.options[2].value = "Visean";
			form.stage.options[3].text = "Tournaisian";
			form.stage.options[3].value = "Tournaisian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Devonian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Famennian";
			form.stage.options[1].value = "Famennian";
			form.stage.options[2].text = "Frasnian";
			form.stage.options[2].value = "Frasnian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Givetian";
			form.stage.options[1].value = "Givetian";
			form.stage.options[2].text = "Eifelian";
			form.stage.options[2].value = "Eifelian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Emsian";
			form.stage.options[1].value = "Emsian";
			form.stage.options[2].text = "Pragian";
			form.stage.options[2].value = "Pragian";
			form.stage.options[3].text = "Lochkovian";
			form.stage.options[3].value = "Lochkovian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Silurian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pridoli")
		{
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.series.options[form.series.selectedIndex].value == "Ludlow")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Ludfordian";
			form.stage.options[1].value = "Ludfordian";
			form.stage.options[2].text = "Gorstian";
			form.stage.options[2].value = "Gorstian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Wenlock")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Homerian";
			form.stage.options[1].value = "Homerian";
			form.stage.options[2].text = "Sheinwoodian";
			form.stage.options[2].value = "Sheinwoodian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Llandovery")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Telychian";
			form.stage.options[1].value = "Telychian";
			form.stage.options[2].text = "Aeronian";
			form.stage.options[2].value = "Aeronian";
			form.stage.options[3].text = "Rhuddanian";
			form.stage.options[3].value = "Rhuddanian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Ordovician")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Darriwilian";
			form.stage.options[1].value = "Darriwilian";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.stage.options[0].text = "Stage";
			form.stage.options[0].value = "";
			form.stage.options[1].text = "Tremadocian";
			form.stage.options[1].value = "Tremadocian";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Cambrian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.stage.options[0].text = "No Stage";
			form.stage.options[0].value = "";
		}
	}
}


// Begin timescale

// SET ERA
function setAge(form)
{
	if(form.era.options[form.era.selectedIndex].value == "Mesozoic")	
	{
		form.age.value = "65 - 250 my";
		form.age.text = "65 - 250 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Cenozoic")	
	{
		form.age.value = "? - 65 my";
		form.age.text = "? - 65 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Paleozoic")	
	{
		form.age.value = "250 - 540 my";
		form.age.text = "250 - 540 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Neoproterozoic")	
	{
		form.age.value = "540 - 1000 my";
		form.age.text = "540 - 1000 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Mesoproterozoic")	
	{
		form.age.value = "1000 - 1600 my";
		form.age.text = "1000 - 1600 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Paleoproterozoic")	
	{
		form.age.value = "1600 - 2500 my";
		form.age.text = "1600 - 2500 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Neoarchean")	
	{
		form.age.value = "2500 - 2800 my";
		form.age.text = "2500 - 2800 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Mesoarchean")	
	{
		form.age.value = "2800 - 3200 my";
		form.age.text = "2800 - 3200 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "Paleoarchean")	
	{
		form.age.value = "3200 - 3600 my";
		form.age.text = "3200 - 3600 my";

	}
	if(form.era.options[form.era.selectedIndex].value == "eoarchean")	
	{
		form.age.value = "3600 - ? my";
		form.age.text = "3600 - ? my";

	}

	// END SET ERA
	// SET SYSTEM

	if (form.era.options[form.era.selectedIndex].value == "Mesozoic")
	{
		if(form.system.options[form.system.selectedIndex].value == "Jurassic")
		{
			form.age.value = "135 - 203 my";
			form.age.text = "135 - 203 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Triassic")
		{
			form.age.value = "203 - 250 my";
			form.age.text = "203 - 250 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Cretaceous")
		{
			form.age.value = "65 - 135 my";
			form.age.text = "65 - 135 my";
		}
	}

	if (form.era.options[form.era.selectedIndex].value == "Cenozoic")
	{
		if(form.system.options[form.system.selectedIndex].value == "Paleogene")	
		{
			form.age.value = "23.5 - 65 my";
			form.age.text = "23.5 - 65 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Neogene")
		{
			form.age.value = "1.75 - 23.5 my";
			form.age.text = "1.75 - 23.5 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Quaternary")
		{
			form.age.value = "? - 1.75 my";
			form.age.text = "? - 1.75 my";
		}
	}
	if (form.era.options[form.era.selectedIndex].value == "Paleozoic")
	{
		if(form.system.options[form.system.selectedIndex].value == "Permian")	
		{
			form.age.value = "250 - 295 my";
			form.age.text = "250 - 295 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Carbonifirous")
		{
			form.age.value = "295 - 355 my";
			form.age.text = "295 - 355 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Devonian")
		{
			form.age.value = "355 - 410 my";
			form.age.text = "355 - 410 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Silurian")	
		{
			form.age.value = "410 - 435 my";
			form.age.text = "410 - 435 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Ordovician")
		{
			form.age.value = "435 - 500 my";
			form.age.text = "435 - 500 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Cambrian")
		{
			form.age.value = "500 - 540 my";
			form.age.text = "500 - 540 my";
		}
	}
	if (form.era.options[form.era.selectedIndex].value == "Neoproterozoic")
	{
		if(form.system.options[form.system.selectedIndex].value == "Neoproterozoic III")	
		{
			form.age.value = "540 - 650 my";
			form.age.text = "540 - 650 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Cryogenian")
		{
			form.age.value = "650 - 850 my";
			form.age.text = "650 - 850 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Tonian")
		{
			form.age.value = "850 - 1000 my";
			form.age.text = "850 - 1000 my";
		}
	}	
	if (form.era.options[form.era.selectedIndex].value == "Mesoproterozoic")
	{
		if(form.system.options[form.system.selectedIndex].value == "Stenian")	
		{
			form.age.value = "1000 - 1200 my";
			form.age.text = "1000 - 1200 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Ectasian")
		{
			form.age.value = "1200 - 1400 my";
			form.age.text = "1200 - 1400 my";
		}
		if(form.system.options[form.system.selectedIndex].value == "Calymmian")
		{
			form.age.value = "1400 - 1600 my";
			form.age.text = "1400 - 1600 my";
		}
	}
	// EINDE SET SYSTEM
	// BEGIN SET SERIES

	// MESOZOIC

	if (form.system.options[form.system.selectedIndex].value == "Cretaceous")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.age.value = "65 - 96 my";
			form.age.text = "65 - 96 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.age.value = "96 - 135 my";
			form.age.text = "96 - 135 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Jurassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.age.value = "135 - 154 my";
			form.age.text = "135 - 154 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.age.value = "154 - 175 my";
			form.age.text = "154 - 175 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.age.value = "175 - 203 my";
			form.age.text = "175 - 203 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Triassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.age.value = "203 - 230 my";
			form.age.text = "203 - 230 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.age.value = "230 - 240 my";
			form.age.text = "230 - 240 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.age.value = "240 - 250 my";
			form.age.text = "240 - 250 my";
		}
	}

	// CENOZOIC

	if (form.system.options[form.system.selectedIndex].value == "Quaternary")
	{
		if (form.series.options[form.series.selectedIndex].value == "Holocene")
		{
			form.age.value = "? - ? my";
			form.age.text = "? - ? my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Pleistocene")
		{
			form.age.value = "? - 5.30 my";
			form.age.text = "? - 5.30 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Neogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pliocene")
		{
			form.age.value = "1.75 - 5.30 my";
			form.age.text = "1.75 - 5.30 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Miocene")
		{
			form.age.value = "5.30 - 23.5 my";
			form.age.text = "5.30 - 23.5 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Paleogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Oligocene")
		{
			form.age.value = "23.5 - 33.7 my";
			form.age.text = "23.5 - 33.7 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Eocene")
		{
			form.age.value = "33.7 - 53 my";
			form.age.text = "33.7 - 53 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Paleocene")
		{
			form.age.value = "53 - 65 my";
			form.age.text = "53 - 65 my";
		}
	}

	// PALEOZOIC
	
	if (form.system.options[form.system.selectedIndex].value == "Permian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lopingian")
		{
			form.age.value = "250 - ? my";
			form.age.text = "250 - ? my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Guadalupian")
		{
			form.age.value = "? - ? my";
			form.age.text = "? - ? my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Cisuralian")
		{
			form.age.value = "? - 295 my";
			form.age.text = "? - 295 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Cabonifirious")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pennsylvanian")
		{
			form.age.value = "295 - ? my";
			form.age.text = "295 - ? my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Mississippian")
		{
			form.age.value = "? - 355 my";
			form.age.text = "? - 355 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Devonian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.age.value = "355 - 375 my";
			form.age.text = "355 - 375 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.age.value = "375 - 390 my";
			form.age.text = "375 - 390 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.age.value = "390 - 410 my";
			form.age.text = "390 - 410 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Silurian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pridoli")
		{
			form.age.value = "410 - 415 my";
			form.age.text = "410 - 415 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Ludlow")
		{
			form.age.value = "415 - 425 my";
			form.age.text = "415 - 425 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Wenlock")
		{
			form.age.value = "425 - 430 my";
			form.age.text = "425 - 430 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Llandovery")
		{
			form.age.value = "430 - 435 my";
			form.age.text = "430 - 435 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Ordovician")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.age.value = "435 - 455 my";
			form.age.text = "435 - 455 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.age.value = "455 - 465 my";
			form.age.text = "455 - 465 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.age.value = "465 - 500 my";
			form.age.text = "465 - 500 my";
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Cambrian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			form.age.value = "500 - ? my";
			form.age.text = "500 - ? my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			form.age.value = "? - 520 my";
			form.age.text = "? - 520 my";
		}
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			form.age.value = "520 - 540 my";
			form.age.text = "520 - 540 my";
		}
	}
	// EINDE SERIES
	// BEGIN STAGE

	// MESOZOIC
			// CRETACEOUS
	if (form.system.options[form.system.selectedIndex].value == "Cretaceous")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Maastrichtian")
			{
				form.age.value = "65 - 72 my";
				form.age.text = "65 - 72 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Campanian")
			{
				form.age.value = "72 - 83 my";
				form.age.text = "72 - 83 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Santonian")
			{
				form.age.value = "83 - 87 my";
				form.age.text = "83 - 87 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Coniacian")
			{
				form.age.value = "87 - 88 my";
				form.age.text = "87 - 88 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Turonian")
			{
				form.age.value = "88 - 92 my";
				form.age.text = "88 - 92 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Cenomanian")
			{
				form.age.value = "92 - 96 my";
				form.age.text = "92 - 96 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Cretaceous")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Albian")
			{
				form.age.value = "96 - 108 my";
				form.age.text = "96 - 108 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Aptian")
			{
				form.age.value = "108 - 113 my";
				form.age.text = "108 - 113 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Barremian")
			{
				form.age.value = "113 - 117 my";
				form.age.text = "113 - 117 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Hauterivian")
			{
				form.age.value = "117 - 123 my";
				form.age.text = "117 - 123 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Valanginian")
			{
				form.age.value = "123 - 131 my";
				form.age.text = "123 - 131 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Berriasian")
			{
				form.age.value = "131 - 135 my";
				form.age.text = "131 - 135 my";
			}
		}
	}
		// JURASSIC

	if (form.system.options[form.system.selectedIndex].value == "Jurassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Tithonian")
			{
				form.age.value = "135 - 141 my";
				form.age.text = "135 - 141 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Kimmeridgian")
			{
				form.age.value = "141 - 146 my";
				form.age.text = "141 - 146 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Oxfordian")
			{
				form.age.value = "146 - 154 my";
				form.age.text = "146 - 154 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Jurassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Callovian")
			{
				form.age.value = "154 - 160 my";
				form.age.text = "154 - 160 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Bathonian")
			{
				form.age.value = "160 - 164 my";
				form.age.text = "160 - 164 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Bajocian")
			{
				form.age.value = "164 - 170 my";
				form.age.text = "164 - 170 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Aalenian")
			{
				form.age.value = "170 - 175 my";
				form.age.text = "170 - 175 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Jurassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Toarcian")
			{
				form.age.value = "175 - 184 my";
				form.age.text = "175 - 184 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Pliensbachian")
			{
				form.age.value = "184 - 191 my";
				form.age.text = "184 - 191 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Sinemurian")
			{
				form.age.value = "191 - 200 my";
				form.age.text = "191 - 200 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Hettangian")
			{
				form.age.value = "200 - 203 my";
				form.age.text = "200 - 203 my";
			}
		}
	}
		// Triassic

	if (form.system.options[form.system.selectedIndex].value == "Triassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Rhetian")
			{
				form.age.value = "203 - ? my";
				form.age.text = "203 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Norian")
			{
				form.age.value = "? - 220 my";
				form.age.text = "? - 220 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Carnian")
			{
				form.age.value = "220 - 230 my";
				form.age.text = "220 - 230 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Triassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Ladinian")
			{
				form.age.value = "230 - 233 my";
				form.age.text = "230 - 233 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Anisian")
			{
				form.age.value = "233 - 240 my";
				form.age.text = "233 - 240 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Triassic")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Olenekian")
			{
				form.age.value = "240 - ? my";
				form.age.text = "240 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Induan")
			{
				form.age.value = "? - 250 my";
				form.age.text = "? - 250 my";
			}
		}
	}
	// EINDE SET MESOZOIC
	// BEGIN CENOZOIC
			// Pliocene
	if (form.system.options[form.system.selectedIndex].value == "Neogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pliocene")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Gelasian")
			{
				form.age.value = "1.75 - ? my";
				form.age.text = "1.75 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Piacenzian")
			{
				form.age.value = "? - 3.4 my";
				form.age.text = "? - 3.4 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Zanclean")
			{
				form.age.value = "3.4 - 5.3 my";
				form.age.text = "3.4 - 5.3 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Neogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Miocene")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Messinian")
			{
				form.age.value = "5.3 - 7.3 my";
				form.age.text = "5.3 - 7.3 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Tortonian")
			{
				form.age.value = "7.3 - 11 my";
				form.age.text = "7.3 - 11 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Serravallian")
			{
				form.age.value = "11 - 14.3 my";
				form.age.text = "11 - 14.3 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Langhian")
			{
				form.age.value = "14.3 - 15.8 my";
				form.age.text = "14.3 - 15.8 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Burdigalian")
			{
				form.age.value = "15.8 - 20.3 my";
				form.age.text = "15.8 - 20.3 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Aquitanian")
			{
				form.age.value = "20.3 - 23.5 my";
				form.age.text = "20.3 - 23.5 my";
			}
		}
	}
	// EINDE NEOGENE
	// BEGIN PALEOGENE
		// OLIGENE
	if (form.system.options[form.system.selectedIndex].value == "Paleogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Oligene")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Chattian")
			{
				form.age.value = "23.5 - 28 my";
				form.age.text = "23.5 - 28 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Rupelian")
			{
				form.age.value = "28 - 33.7 my";
				form.age.text = "28 - 33.7 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Paleogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Eocene")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Priabonian")
			{
				form.age.value = "33.7 - 37 my";
				form.age.text = "33.7 - 37 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Bartonian")
			{
				form.age.value = "37 - 40 my";
				form.age.text = "37 - 40 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Lutetian")
			{
				form.age.value = "40 - 46 my";
				form.age.text = "40 - 46 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Ypresian")
			{
				form.age.value = "46 - 53 my";
				form.age.text = "46 - 53 my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Paleogene")
	{
		if (form.series.options[form.series.selectedIndex].value == "Paleocene")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Thanetian")
			{
				form.age.value = "53 - ? my";
				form.age.text = "53 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Selandian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Danian")
			{
				form.age.value = "? - 65 my";
				form.age.text = "? - 65 my";
			}
		}
	}
	// EINDE PALEOGENE
	// BEGIN PALEOZOIC
		// PERMIAN
	if (form.system.options[form.system.selectedIndex].value == "Permian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lopingian")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Changhsingsian")
			{
				form.age.value = "250 - ? my";
				form.age.text = "250 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Wuchiapigian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}

		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Permian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Guadalupian")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Capitanian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Wordian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Roadian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Permian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Cisuralian")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Kungurian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Artinskian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Sakmarian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Asselian")
			{
				form.age.value = "? - 295 my";
				form.age.text = "? - 295 my";
			}
		}
	}
	// Einde Permian
	// BEGIN CARBONIFIROUS
		// PENNSYLVANIAN
	if (form.system.options[form.system.selectedIndex].value == "Carbonifirous")
	{
		if (form.series.options[form.series.selectedIndex].value == "Pennsylvanian")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Gzhelian")
			{
				form.age.value = "295 - ? my";
				form.age.text = "295 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Kazimovian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Moscovian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Bashkirian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
		}
	}
	if (form.system.options[form.system.selectedIndex].value == "Carbonifirous")
	{
		if (form.series.options[form.series.selectedIndex].value == "Mississippian")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Serpukhovian")
			{
				form.age.value = "? - 325 my";
				form.age.text = "? - 325 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Vissean")
			{
				form.age.value = "325 - 345 my";
				form.age.text = "325 - 345 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Tournaisian")
			{
				form.age.value = "345 - 355 my";
				form.age.text = "345 - 355 my";
			}
		}
	}
	// EINDE CARBONIFIROUS
	// BEGIN DEVONIAN
		// Upper/Late
	if (form.system.options[form.system.selectedIndex].value == "Devonian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Upper/Late")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Famennian")
			{
				form.age.value = "355 - 370 my";
				form.age.text = "355 - 370 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Frasnian")
			{
				form.age.value = "370 - 375 my";
				form.age.text = "370 - 375 my";
			}
		}
	}
	// Middle
	if (form.system.options[form.system.selectedIndex].value == "Devonian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Givetian")
			{
				form.age.value = "375 - 380 my";
				form.age.text = "375 - 380 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Eifelian")
			{
				form.age.value = "380 - 390 my";
				form.age.text = "380 - 390 my";
			}
		}
	}
	// Lower/Early
	if (form.system.options[form.system.selectedIndex].value == "Devonian")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Emsian")
			{
				form.age.value = "390 - 400 my";
				form.age.text = "390 - 400 my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Pragian")
			{
				form.age.value = "400 - ? my";
				form.age.text = "400 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Lochkovian")
			{
				form.age.value = "? - 410 my";
				form.age.text = "? - 410 my";
			}
		}
	}
	// EINDE DEVONIAN
	// BEGIN SILURAN
		// LUDLOW
	if (form.system.options[form.system.selectedIndex].value == "Siluran")
	{
		if (form.series.options[form.series.selectedIndex].value == "Ludlow")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Ludfordian")
			{
				form.age.value = "415 - ? my";
				form.age.text = "415 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Gorstian")
			{
				form.age.value = "? - 425 my";
				form.age.text = "? - 425 my";
			}
		}
	}
	// Wenlock
	if (form.system.options[form.system.selectedIndex].value == "Siluran")
	{
		if (form.series.options[form.series.selectedIndex].value == "Wenlock")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Homerian")
			{
				form.age.value = "425 - ? my";
				form.age.text = "425 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Sheinwoodian")
			{
				form.age.value = "? - 430 my";
				form.age.text = "? - 430 my";
			}
		}
	}
	// Llandovery
	if (form.system.options[form.system.selectedIndex].value == "Siluran")
	{
		if (form.series.options[form.series.selectedIndex].value == "Llandovery")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Telychian")
			{
				form.age.value = "430 - ? my";
				form.age.text = "430 - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Aeronian")
			{
				form.age.value = "? - ? my";
				form.age.text = "? - ? my";
			}
			if (form.stage.options[form.stage.selectedIndex].value == "Rhuddanian")
			{
				form.age.value = "? - 435 my";
				form.age.text = "? - 435 my";
			}
		}
	}
	// EINDE SILURAN
	// BEGIN ORDOVICIAN
	// Middle
	if (form.system.options[form.system.selectedIndex].value == "Ordovician")
	{
		if (form.series.options[form.series.selectedIndex].value == "Middle")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Darriwilian")
			{
				form.age.value = "455 - ? my";
				form.age.text = "455 - ? my";
			}
		}
	}
	// Lower/Early
	if (form.system.options[form.system.selectedIndex].value == "Ordovician")
	{
		if (form.series.options[form.series.selectedIndex].value == "Lower/Early")
		{
			if (form.stage.options[form.stage.selectedIndex].value == "Tremadocian")
			{
				form.age.value = "? - 500 my";
				form.age.text = "? - 500 my";
			}

		}
	}
}