var theImages = new Array()
var MyElement = "topright" 

theImages[0] = 'images/top_right1.jpg'
theImages[1] = 'images/top_right2.jpg'
theImages[2] = 'images/top_right3.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]
}


function showImage(){
	var whichImage = Math.round(Math.random()*(p-1));
	var $header = document.getElementById(MyElement);
	var $backgroundurl = $header.style.backgroundImage;
	var ImgURL = "url(" + theImages[whichImage] + ")";
	$header.style.backgroundImage = ImgURL;	

}