function popupBZOpis(mylink, windowname) {
    if (!window.focus) return true;
    var href;
    if (typeof (mylink) == 'string')
        href = mylink;
    else
        href = mylink.href;
    okno = window.open(href, windowname, 'menubar=no, status=no, titlebar=no, toolbar=no, height=300, width=600, top=100, left=50');
    okno.focus();
    return false;
}