function popup(mylink, windowname)
{
    if (! window.focus)return true;
    var href;
    if (typeof(mylink) == 'string')
       href=mylink;
    else
       href=mylink.href;
    window.open(href, windowname, 'width=400,height=500,scrollbars=yes,menubar=no,toolbar=no,dependent=yes');
    return false;
}