function popup(url, width, height, name, scrollbars, dependent, resizable) {

    var left = (screen.width / 2) - width / 2;
    var top = (screen.height / 2) - height / 2;
    mypopup = window.open(url, name, "left="+left+",top="+top+",width="+width+",height="+height+",dependent=" + ((dependent) ? "yes" : "no") + ",location=no,menubar=no,resizable=" + ((resizable) ? "yes" : "no") + ",scrollbars=" + ((scrollbars) ? "yes" : "no") + ",status=no,toolbar=no");
    mypopup.focus();
    return;

}