window.addEvent('domready', function()
{
	preload_image_object = new Image();
	// set image url
	image_url = new Array();
	image_url[0] = "../../images/close.png";
	image_url[1] = "../../images/pad.png";
	image_url[2] = "../../images/topper.png";
	image_url[3] = "../../images/bottom.png";
	
	for(i=0;i<=image_url.length;i++) preload_image_object.src = image_url[i];
});