YAHOO.namespace("popup");

YAHOO.popup.open = function (loc, winname, widthh, heightt, params) {
	var tp = Math.ceil((screen.height - heightt) / 3);
	var lf = Math.ceil((screen.width - widthh) / 2);
	if (params.length > 0)
		params = "," + params;
	var win = window.open(loc, winname, "width=" + widthh + ",height=" + heightt + ",top=" + tp + ",left=" + lf + params);
	win.focus();
	return win;
}