var theImages = new Array(); // do not change this
theImages[0] = 'im/header/bg_image1.jpg';
theImages[1] = 'im/header/bg_image2.jpg';
theImages[2] = 'im/header/bg_image3.jpg';
theImages[3] = 'im/header/bg_image4.jpg';

// do not edit anything below this line

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]+'">');
}