if (document.images)
{
listen_on = new Image();
listen_on.src = "wp-content/uploads/2009/08/btn_listen_on.jpg";
listen_off = new Image();
listen_off.src = "wp-content/uploads/2009/08/btn_listen_off.jpg";

itunes_on = new Image();
itunes_on.src = "wp-content/uploads/2009/08/btn_itunes_on.jpg";
itunes_off = new Image();
itunes_off.src = "wp-content/uploads/2009/08/btn_itunes_off.jpg";

amazon_on = new Image();
amazon_on.src = "wp-content/uploads/2009/08/btn_amazon_on.jpg";
amazon_off = new Image();
amazon_off.src = "wp-content/uploads/2009/08/btn_amazon_off.jpg";

buy_on = new Image();
buy_on.src = "wp-content/uploads/2009/08/btn_buy_on.jpg";
buy_off = new Image();
buy_off.src = "wp-content/uploads/2009/08/btn_buy_off.jpg";


}

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

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