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) {
		topnav_01_over = newImage("/_images/topnav_01-over.gif");
		topnav_02_over = newImage("/_images/topnav_02-over.gif");
		topnav_03_over = newImage("/_images/topnav_03-over.gif");
		topnav_04_over = newImage("/_images/topnav_04-over.gif");

		leftnav_01_over = newImage("/_images/leftnav_01-over.gif");
		leftnav_02_over = newImage("/_images/leftnav_02-over.gif");
		leftnav_03_over = newImage("/_images/leftnav_03-over.gif");
		leftnav_04_over = newImage("/_images/leftnav_04-over.gif");
		leftnav_05_over = newImage("/_images/leftnav_05-over.gif");
		leftnav_06_over = newImage("/_images/leftnav_06-over.gif");
		leftnav_07_over = newImage("/_images/leftnav_07-over.gif");

		preloadFlag = true;
	}
}