var backImage = ["01322","01938","04866","07853","08042","09229","10181","11066","12966","13277","14838"];
  var d = new Date(); var min=d.getMinutes()+1; 
  var whichImage= ~~(backImage.length*(min/62));
  //alert(min+","+whichImage);
  if (document.body){
   image = "url('http://www.jpl.nasa.gov/spaceimages/images/wallpaper/PIA"+backImage[whichImage]+"-1280x1024.jpg')";
   document.body.style.backgroundImage = image;
  }