function getRandomNumberOtherThan(limit, exclude)
   {
      var ra;
      
      do
      {
         ra = getRandomNumber(0,limit);
      }
      while(ra == exclude);
      
      return ra;
   }
   
   function getRandomNumber(floor, limit)
   {
      return floor + Math.round(Math.random() * (limit-floor))
   }
   
   function flipImage(target, imagepath)
   {
      target.src = imagepath;
   }