function preloadMoreImages() {
if (document.images)
	{
	var btn_moundsites_roll = new Image
		btn_moundsites_roll.src = "images/btn_moundsites_over.gif"
	var btn_gundersensite_roll = new Image
		btn_gundersensite_roll.src = "images/btn_gundersensite_over.gif"
	var btn_azatlan_roll = new Image
		btn_azatlan_roll.src = "images/btn_azatlan_over.gif"
	var btn_nicholls_roll = new Image
		btn_nicholls_roll.src = "images/btn_nicholls_over.gif"
	var btn_oldcopper_roll = new Image
		btn_oldcopper_roll.src = "images/btn_oldcopper_over.gif"
	var btn_silvermound_roll = new Image
		btn_silvermound_roll.src = "images/btn_silvermound_over.gif"
	}
}