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) {
		        	diamonds_on = newImage("images/nav_diamonds_over.gif");
					custom_on = newImage("images/nav_custom_over.gif");
					designer_on = newImage("images/nav_designer_over.gif");
					colored_on = newImage("images/nav_colored_over.gif");
					estate_on = newImage("images/nav_estate_over.gif");
					visit_on = newImage("images/nav_visit_over.gif");
					contact_on = newImage("images/nav_contact_over.gif");
		        preloadFlag = true;
		    }
		}