function openWin(url, width, height, scrollbars) {
	if (!width) width = 640;
	if (!height) height = 480;
	if (!scrollbars) scrollbars = "yes";
	window.open(url,"","width=" + width + ",height=" + height + ",toolbar=yes,location=no,directories=no,status=no,menubar=yes,scrollbars=" + scrollbars + ",resizable=yes");
}