var speed = 3000;
var crossFadeDuration = 2;
var Pic = new Array();

Pic[0] = 'images/header_bg.jpg';
Pic[1] = 'images/header_bg_1.jpg';
Pic[2] = 'images/header_bg_2.jpg';

var t;
var j = 0;
var p = Pic.length;

var preLoad = new Array();
for (i = 0; i < p; i++){
   preLoad[i] = new Image();
   preLoad[i].src = Pic[i];}
   
function runSlideShow(){
obj = document.getElementById('head')

if (document.all){
    obj.style.filter="blendTrans(duration=crossFadeDuration)";
    obj.filters.blendTrans.Apply();
    obj.filters.blendTrans.Play();}  

if (obj){
    obj.style.background= 'url('+ Pic[j] + ')';    
    j = j + 1
    if (j > (p-1)) j=0
    t = setTimeout('runSlideShow()', speed)}    

}