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) {
		Menu_Home_white_over = newImage("images/Menu_Home-white-over.gif");
		Menu_Where_blue_over = newImage("images/Menu_Where-blue-over.gif");
		Menu_Testimonial_blue_over = newImage("images/Menu_Testimonial-blue-over.gif");
		Menu_Doctor_blue_over = newImage("images/Menu_Doctor-blue-over.gif");
		Menu_Ergonomics_blue_over = newImage("images/Menu_Ergonomics-blue-over.gif");
		Menu_Ads_blue_over = newImage("images/Menu_Ads-blue-over.gif");
		Menu_Blog_blue_over = newImage("images/Menu_Blog-blue-over.gif");
		preloadFlag = true;
	}
}