var dt; var cn;
   
   function switchImg(n,s)
   {
      if(!document.images) return;
      dt = document.images[n].src; cn = n;
      var p = (dt.indexOf("/")>-1)?dt.substring(0,dt.lastIndexOf("/")+1):"";
      document.images[n].src = p+s;
   }
   
   function resetImg()
   {
      document.images[cn].src = dt;
   }