function newImage(arg) {
	if (document.images) {
		rslt = new Image();
		rslt.src = arg;
		return rslt;
	}
}

function changeImages() {
	if (document.images && (preloadFlag == true)) {
		for (var i=0; i<changeImages.arguments.length; i+=2) {
			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
		}
	}
}

var preloadFlag = false;
function preloadImages() {
if (document.images) {
mn_home_over = newImage("headimg/mn_home_over.gif");
mn_boxes_over = newImage("headimg/mn_boxes_over.gif");
mn_display_over = newImage("headimg/mn_display_over.gif");
mn_special_over = newImage("headimg/mn_special_over.gif");
mn_new_over = newImage("headimg/mn_new_over.gif");
mn_about_over = newImage("headimg/mn_about_over.gif");
mn_presdir_over = newImage("headimg/mn_presdir_over.gif");
mn_catreq_over = newImage("headimg/mn_catreq_over.gif");
box_backbtn_over = newImage("boximg/box_backbtn_over.gif");
box_nextbtn_over = newImage("boximg/box_nextbtn_over.gif");
box_pricing_over = newImage("boximg/box_pricing_over.gif");
preloadFlag = true;
}
}