// Set speed (milliseconds)
var speed = 4000

// Set Picture Array
var Pic = new Array()

// Set Pics
Pic[0] = 'images/slide1.gif'
Pic[1] = 'images/slide2.png'
Pic[2] = 'images/slide3.png'

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 runBGSlideShow(){
if (document.body){
document.all.test.style.backgroundImage = 'url('+Pic[j]+')';
j = j + 1
if (j > (p-1)) j=0
t = setTimeout('runBGSlideShow()', speed)
}
}