function popWindow(url, name, width, height) {
	var x = (screen.width - width)/2;
	var y = (screen.height - height)/2;
    var opts = 'height=' + height + ',width=' + width + ",screenX=" + x + ",left=" + x + ",screenY=" + y + ",top=" + y + ',location=no,scrollbars=yes,menubar=no,resizable=yes,status=yes,toolbar=no';

    var newWindow = window.open(url, name, opts);
    newWindow.focus();

}