function preloadMoreImages() {
if (document.images)
	{
	var btn_endiceage_roll = new Image
		btn_endiceage_roll.src = "images/btn_endiceage_over.gif"
	var btn_huntinggathering_roll = new Image
		btn_huntinggathering_roll.src = "images/btn_huntinggathering_over.gif"
	var btn_tools_roll = new Image
		btn_tools_roll.src = "images/btn_tools_over.gif"
	var btn_nomadiclifestyle_roll = new Image
		btn_nomadiclifestyle_roll.src = "images/btn_nomadiclifestyle_over.gif"
	var btn_lifestylechanges_roll = new Image
		btn_lifestylechanges_roll.src = "images/btn_lifestylechanges_over.gif"
	var btn_overviewpdf_roll = new Image
		btn_overviewpdf_roll.src = "images/btn_overviewpdf_over.gif"
	}
}