// JavaScript Document
<!-- 
if (document.getElementById) { window.onload = swap };
function swap() {
var numimages=14;
rndimg = new Array("images/random/random1.jpg", "images/random/random2.jpg", "images/random/random3.jpg", "images/random/random4.jpg", "images/random/random5.jpg", "images/random/random6.jpg","images/random/random7.jpg", "images/random/random8.jpg", "images/random/random9.jpg", "images/random/random10.jpg", "images/random/random11.jpg", "images/random/random12.jpg", "images/random/random13.jpg", "images/random/random14.jpg"); 
x=(Math.floor(Math.random()*numimages));
randomimage=(rndimg[x]);
document.getElementById("headerimage").style.backgroundImage = "url("+ randomimage +")"; 
}
//-->