function ButtonOver (imgName, srcName, txtStatus) 
{
    if (document.images)
    {
       document[imgName].src = srcName;
       window.status = txtStatus;
    }
    return true;
}
   
function ButtonOut  (imgName, srcName, txtStatus) 
{
    if (document.images)
    {
        document[imgName].src = srcName;
		window.status = txtStatus;
    }
}

var aryImages = new Array(2);

  aryImages[1] = "images/but_home_on.jpg";
  aryImages[2] = "images/but_about_on.jpg";
  aryImages[3] = "images/but_visit_on.jpg";
  aryImages[4] = "images/but_shop_on.jpg";
  aryImages[5] = "images/but_learn_on.jpg";
  for (i=0; i < aryImages.length; i++) 
  {
    var preload = new Image();
    preload.src = aryImages[i];
  }