function ChangeCSSBgImg() {
if (!document.getElementById) return false;

var MyElement = "randomimg" //The ID of the element you want to change
var ImgPath = "/Themes/Outback/Images/FreeRange/banner/" //The file path to your images

if (!document.getElementById(MyElement)) return false;

var random_images = new Array ();
random_images[0] = "banner_01.jpg";
random_images[1] = "banner_02.jpg";
random_images[2] = "banner_03.jpg";
random_images[3] = "banner_04.jpg";
random_images[4] = "banner_05.jpg";
random_images[5] = "banner_06.jpg";
random_images[6] = "banner_07.jpg";
random_images[7] = "banner_08.jpg";
random_images[8] = "banner_09.jpg";
random_images[9] = "banner_10.jpg";
random_images[10] = "banner_11.jpg";
random_images[11] = "banner_12.jpg";


var $header = document.getElementById(MyElement);
var $backgroundurl = $header.style.backgroundImage;
var ImgURL = "url(" + ImgPath + random_images[rand(random_images.length)] + ")";

if ($backgroundurl != ImgURL) {
$header.style.backgroundImage = ImgURL;
}

movement = setTimeout("ChangeCSSBgImg()",99000000);
}

/* random number generator */
function rand(n) {
    return ( Math.floor ( Math.random ( ) * n ) );
}

/* Custom onload function */

function addLoadEvent(func) {
    var oldonload = window.onload;
        if (typeof window.onload != 'function') {
        window.onload = func;
        } else {
        window.onload = function() {
    oldonload();
func();
}
}
}

/* trigger onload */

addLoadEvent(ChangeCSSBgImg);