function newImage( imgSrc ){

 var imgName = new Image();
 imgName.src = imgSrc;

 return imgName;

}

function change( imgName, imgLocation )
{
 document[imgName].src = imgLocation ;
}

var preloadFlag = false;
function loadImages()
{
 if (document.images)
 {

  aboutus_over = newImage("../images/aboutus_o.gif");
  training_over = newImage("../images/training_o.gif");
  puppystuff = newImage("../images/puppystuff_o.gif");
  gallery = newImage("../images/gallery_o.gif");
  trainer = newImage("../images/trainerprogram_o.gif");

 preloadFlag = true;
 }
}