function abrirPopUp(url, w_width, w_height){
	pos_left = (screen.availWidth - 12 - w_width)/2;
	pos_top = (screen.availHeight - 37 - w_height)/2;
	window.open(url,"","toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=yes, resizable=yes, height=" + w_height + ",width=" + w_width + ",left=" + pos_left + ",top=" + pos_top + "");
}

/*Eg:windowLocation("http://<?= $_SERVER["HTTP_HOST"].dirname($_SERVER["PHP_SELF"]) ?>/$relative_url");*/
function windowLocation(url) {
    window.location = url;
}