function popup(mylink, windowname, width, height)
{
    if (! window.focus)return true;

    var href;
    if (typeof(mylink) == 'string')
        href=mylink;
    else
        href=mylink.href;
    
    window.open(href, "_blank", 'width=' + width + ',height=' + height + ',scrollbars=no, resizable=no');
    
    return false;
}