// Change the overlay on "montage" pics
      var altX = new Image();              // Create an Image object
      var altY = new Image();
      altX.src = "./images/clickX.gif";   // this loads it?
      altY.src = "./images/clickY.gif";

      function imgToClick(thePic)
       {
            thePic.src = altY.src;
       }
      function imgToStay(thePic,Horiz)
       {
            thePic.src = altX.src;
       }