// random background image



if (document.getElementById) { window.onload = swap };
function swap() {
var numimages=4;
rndimg = new Array("images/banner_top1_2.jpg","images/banner_top1_3.jpg","images/banner_top1_4.jpg","images/banner_top1_5.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("banner").style.backgroundImage = "url("+ randomimage +")"; 
}