var theImages = new Array() 
theImages[0] = '/prudential-plc/images/home_pic1.jpg'
theImages[1] = '/prudential-plc/images/home_pic2.jpg'
theImages[2] = '/prudential-plc/images/home_pic3.jpg'
theImages[3] = '/prudential-plc/images/home_pic4.jpg'
theImages[4] = '/prudential-plc/images/home_pic5.jpg'
var j = 0
var p = theImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = theImages[i]
}
var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+theImages[whichImage]+'">');
}