var ventana;
function WindowOpen(url) {
    ventana = window.open(url, '', '');

    //ventana.onclose = WindowClose();
    //ventana.onunload = function() { if ((ventana.event.clientX < 0) || (ventana.event.clientY < 0)) { WindowClose(); } };
}

function WindowClose() {
    __doPostBack('Refresh', '');
}