function preloadMoreImages() {
if (document.images)
	{
	var btn_redocher_roll = new Image
		btn_redocher_roll.src = "images/btn_redocher_over.gif"
	var btn_food_roll = new Image
		btn_food_roll.src = "images/btn_food_over.gif"
	var btn_tools_roll = new Image
		btn_tools_roll.src = "images/btn_tools_over.gif"
	var btn_pottery_roll = new Image
		btn_pottery_roll.src = "images/btn_pottery_over.gif"
	var btn_settlement_roll = new Image
		btn_settlement_roll.src = "images/btn_settlement_over.gif"
	var btn_rockart_roll = new Image
		btn_rockart_roll.src = "images/btn_rockart_over.gif"
	var btn_mounds_roll = new Image
		btn_mounds_roll.src = "images/btn_mounds_over.gif"
	var btn_hopewell_roll = new Image
		btn_hopewell_roll.src = "images/btn_hopewell_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"
	}
}