function picWin(pic,ww,wh) {
  var screen_height = screen.height;
  var screen_width  = screen.width;
  var window_center_height = (screen_height - wh)/2;
  var window_center_width  = (screen_width  - ww) /2;
  if (navigator.appName == "Netscape") {
    imagewindow = window.open('sites/bild.php?pict='+pic,'_blank','statusbar=no,toolbar=no,resizable=no,scrollbars=no,menubar=no,status=0,innerWidth='+ww+',innerHeight='+wh+',screenX='+window_center_width+',screenY='+window_center_height+'');
  }
  else {
    imagewindow = window.open('sites/bild.php?pict='+pic,'_blank','statusbar=no,toolbar=no,resizable=no,scrollbars=no,menubar=no,status=0,width='+ww+',height='+wh+',left='+window_center_width+',top='+window_center_height+'');
  }
}