function PopUp(url, width, height){
	var sWidth = window.screen.width;
	var sHeight = window.screen.height;
	if (width == 0 || height == 0){
		width = sWidth - 120;
		height = sHeight - 180;
	}else{
		width += 24;
		height += 30;
	}
	var left = (sWidth - width) / 2;
	var top = (sHeight - height) / 2;
	top -= 30; // compensate for task bar
	var specs = "resizable=yes, scrollbars=no, width=" + width + ", height=" + height + ", top=" + top + ", left=" + left;
	var popup = window.open(url, "popup", specs);
	popup.focus();
}