function preloadImages() 
	{ 
		image1 = new Image();
		image1.src = "/_images/buttons1.gif";
		image2 = new Image();
		image2.src = "/_images/buttons2.gif";
		image3 = new Image();
		image3.src = "/_images/buttons3.gif";
		image4 = new Image();
		image4.src = "/_images/top-down.gif";
	}