g_arrImagesOverOn  = new Array();
  g_arrImagesOverOff = new Array();
  
  function setImageOver(id, src){
    g_arrImagesOverOn[id] = new Image();
    g_arrImagesOverOn[id].src = src;
  }
  
  function changeImageOn(id){
    var img = getE(id);
    if(img){
      if(g_arrImagesOverOn[id]){
        var src = g_arrImagesOverOn[id].src;
        if(src){
          g_arrImagesOverOff[id] = img.src;
          img.src = src;
        }
      }
    }
  }
  
  function changeImageOff(id){
    var img = getE(id);
    if(img){
      if(g_arrImagesOverOff[id]){
        var src = g_arrImagesOverOff[id];
        if(src){
          img.src = src;
        }
      }
    }
  }