if (document.images) {
	img1on = new Image();           // Active images
	img1on.src = "../images/btn_download_on.gif";
	img2on = new Image();
	img2on.src = "../images/btn_enjoy_on.gif";
	img3on = new Image();
	img3on.src = "../images/btn_buy_on.gif";
	img1off = new Image();          // Inactive images
	img1off.src = "../images/btn_download_off.gif";
	img2off = new Image();
	img2off.src = "../images/btn_enjoy_off.gif";
	img3off = new Image();
	img3off.src = "../images/btn_buy_off.gif";
	img1down = new Image();           // Down images
	img1down.src = "../images/btn_download_down.gif";
	img2down = new Image();
	img2down.src = "../images/btn_enjoy_down.gif";
	img3down = new Image();
	img3down.src = "../images/btn_buy_down.gif";
  }
    function imgOn(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "on.src");
            }
    }
    function imgOff(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "off.src");        
            }
    }
    function imgDown(imgName) {
            if (document.images) {
                document[imgName].src = eval(imgName + "down.src");
            }
    }