<!-- 
if (document.getElementById) { window.onload = swap };
function swap() {
var numimages=4;
rndimg = new Array("/images/banners/comp/comp_1.jpg","/images/banners/comp/comp_2.jpg","/images/banners/comp/comp_3.jpg","/images/banners/comp/comp_4.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("main_img").style.backgroundImage = "url("+ randomimage +")"; 
}

//-->