var olk_mediawindow = '';
function olk_ShowMedium(bild, breite, hoehe)
{
  var url = './bilder/'+bild;
  var hor = 800;
  var ver = 500;
  if (arguments.length==3) {
    hor = parseInt(breite);
    ver = parseInt(hoehe);
  }
  if (olk_mediawindow.location && !olk_mediawindow.closed) {
    olk_mediawindow.location.href = url;
  } else {
    var jetzt = new Date();
    olk_mediawindow=window.open(url, 'olk_win_'+jetzt.getTime(), 'height='+ver+',width='+hor+',toolbar=no,resizable=yes,scrollbars=yes,location=no');
    if (!olk_mediawindow.opener) olk_mediawindow.opener = self;
  }
  if (window.focus) olk_mediawindow.focus();
}