// JavaScript Document

if (document.getElementById) { window.onload = swap };
function swap() {
var numimages=4;
rndimg = new Array("images/random_images/greatwallofchina.jpg", "images/random_images/colosseum.jpg", "images/random_images/prague.jpg", "images/random_images/rome.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("content2").style.backgroundImage = "url("+ randomimage +")"; 
}