function popup(popup_page, popup_name, popup_width, popup_height)
{
    var pos_left = ((screen.width/2)-(popup_width/2));
    var pos_top = ((screen.height/2)-(popup_height/2))
    var features = "resizable=yes,scrollbars=no,width="+popup_width+",height="+popup_height + ",top=" + pos_top + ",left=" + pos_left;
    var win = window.open('/php/' + popup_page, popup_name, features);
        win.title='Foo';
    win.focus();
}