//This caches the images we need for the buttons
      var image0=new Image();
      image0.src="/images/buy-bttn.png";
      var image1=new Image();
      image1.src="/images/buy-bttn-over.png";


//Swaps out an image with another.  Intended to switch visual states for buttons.
function imgStateChange(imgID,imgOverState)
{
   document.getElementById(imgID).src=imgOverState;
}