var hdr_prefetch_imgList = [];

for (var i = 1; i < 11; i++)
{
	var url = "App_Themes/ProEnergy1/images/header_back" + (i < 10 ? "0" : "") + (i) + ".jpg";
	var img = new Image();
	img.src = url;
	hdr_prefetch_imgList.push(img);
}