function nu_ilk(url_pop)
    {
     var popwidth=200;
     var popheight=100;
     var popleft=100;
     var poptop=100;
     bak_ilk=window.open(url_pop,'bak',
                                      'toolbar=no,status=no,menubar=no,location=no,directories=no,resizable=no,scrollbars=no,width='+ popwidth+',height='+ popheight+',left='+ popleft+',top='+ poptop);
    }