// ----------------
// zobrazi obrazok v novom okne
function okno(url, alt) {

  sir = 560; vys = 590;
  x = 0;
  y = 0;
//  x = (screen.width / 2) - (sir / 2);
//  y = (screen.height / 2) - (vys / 2);

//  window.open('image.php?'+url, '', 'location=no,menubar=no,status=no,height='+vys+',width='+sir+'screenX='+x+'screenY='+y+'');

  if (!alt) alt = '';

  alt = escape(alt);

  window.open('/image.php?url='+url+'&alt='+alt, '',
    'location=no,menubar=no,status=no,height='+
    vys+',width='+sir+'screenX='+x+'screenY='+y+'');
}