var popups=new Array()
function picture_zoom(theURL,winName,features) {
   if (popups.length) if (!popups[popups.length-1].closed) popups[popups.length-1].close()
   popups[popups.length] = window.open(theURL,winName,features);
   var picture = popups[popups.length-1]
   picture.focus()
}
function cleanup() {
   if (popups.length)
      for(var i=0;i<popups.length;i++) {
         if (!popups[i].closed) popups[i].close()
      }
}
function unload() {
   if (!window.opener) {
   cleanup()
   }
}
window.onunload = unload