function preloadMoreImages() {
if (document.images)
	{
	var btn_sitecredits_roll = new Image
		btn_sitecredits_roll.src = "images/btn_sitecredits_over.gif"
	var btn_introduction_roll = new Image
		btn_introduction_roll.src = "images/btn_introduction_over.gif"
	var btn_archethics_roll = new Image
		btn_archethics_roll.src = "images/btn_archethics_over.gif"
	var btn_locatingsites_roll = new Image
		btn_locatingsites_roll.src = "images/btn_locatingsites_over.gif"
	var btn_reportingsites_roll = new Image
		btn_reportingsites_roll.src = "images/btn_reportingsites_over.gif"
	var btn_excavations_roll = new Image
		btn_excavations_roll.src = "images/btn_excavations_over.gif"
	var btn_historicarch_roll = new Image
		btn_historicarch_roll.src = "images/btn_historicarch_over.gif"
	var btn_features_roll = new Image
		btn_features_roll.src = "images/btn_features_over.gif"
	var btn_excavationtech_roll = new Image
		btn_excavationtech_roll.src = "images/btn_excavationtech_over.gif"
	var btn_sharing_roll = new Image
		btn_sharing_roll.src = "images/btn_sharing_over.gif"
	var btn_documentation_roll = new Image
		btn_documentation_roll.src = "images/btn_documentation_over.gif"
	var btn_finescalerecovery_roll = new Image
		btn_finescalerecovery_roll.src = "images/btn_finescalerecovery_over.gif"
	}
}