function openwindow(url,width,height)
{
	window.open(url, "", "width=" + width + "px, height=" + height + "px, resizable, scrollbars=yes");
}

function roll(img_name, img_src)
{
	document[img_name].src = img_src;
}

function listingswap(imgname) {
	document.images["listing-img"].src = "images/listings/" + imgname;
}