// JavaScript Document
if (document.getElementById) 
{ 
	window.onload = swap
};
function swap() 
{
	var numimages=5;
	rndimg = new Array("../images/usu01.png", "../images/usu02.png", "../images/usu04.png", "../images/usustaff.png", "../images/usugame.png"); 
	x=(Math.floor(Math.random()*numimages));
	randomimage=(rndimg[x]);
	document.getElementById("img").style.backgroundImage = "url("+ randomimage +")";
}