function popup(url, pWidth, pHeight) {

	var vHndl, vTop, vLeft;
	
	vLeft = (screen.width - pWidth) / 2;
	vTop = (screen.height - pHeight) / 2;
	
	vHndl = window.open(url, "popup", "toolbar=no, location=no, status=yes, menubar=no, directories=no, scrollbars=no, resizable=no, width=" + pWidth + ", height=" + pHeight + ", left=" + vLeft + ", top=" + vTop);
	
}