Crear popups

Código necesario en JS para generar popups sin barra de menu, ni estatus, ni toolbars.

var dir = "http://www.mauriciovera.com/";
var alea = "P"+Math.round(Math.random()*1000);
LeftPosition = (screen.width) ? (screen.width-980)/2 : 0;
TopPosition = (screen.height) ? (screen.height-600)/2 : 0;
window.open(dir,alea,'top=' + TopPosition + ',left=' + LeftPosition + ',width=980,height=600,directories=no,location=no,menubar=no,scrollbars=yes,status=no,toolbar=no,resizable=yes');