function popup(mylink, windowName) {
    if(! window.focus)  return true;
    var href;
    if(typeof(mylink) == 'string')
        href = mylink;
    else
        href = mylink.href;
    popupWin = window.open(href, windowName, 'width=660, height=500, scrollbars=yes');
    return false;
}