// JavaScript Document
var upperLimit = 7;
var imageRootName ="/images/moimg/random/header";
var imageNumber = Math.floor(Math.random()*upperLimit);
var imageFullName= imageRootName + imageNumber + ".jpg";

function init() {
var theURL = "url(" + imageFullName + ")";
//alert("theURL"+theURL);
document.getElementById('mainHeader').style.backgroundImage=theURL;
return;
}
window.onload = init;