if (document.images)
   {
     buyButton= new Image(131,52);
     buyButton.src="images/BuyOnLineNormal.png";  

     buyButton_over= new Image(131,52);
     buyButton_over.src="images/BuyOnLineHover.png";

     buyButton_down= new Image(131,52);
     buyButton_down.src="images/BuyOnLineDown.png";
   }

function lightup(imgName)
 {
   if (document.images)
    {
      imgOn=eval(imgName + "_over.src");
      document[imgName].src= imgOn;
    }
 }

function turnoff(imgName)
 {
   if (document.images)
    {
      imgOff=eval(imgName + ".src");
      document[imgName].src= imgOff;
    }
 }

function depress(imgName)
 {
   if (document.images)
    {
      imgDown=eval(imgName + "_down.src");
      document[imgName].src= imgDown;
    }
 }