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) {
			about_us_over = newImage("images/about-us-over.jpg");
			homes_over = newImage("images/homes-over.jpg");
			selling_over = newImage("images/selling-over.jpg");
			renting_over = newImage("images/renting-over.jpg");
			contacts_over = newImage("images/contacts-over.jpg");
			preloadFlag = true;
		}
	}