if (document.images) {

             revue02on = new Image();     revue02on.src = "../images/gif/btn02on.gif";
             revue01on = new Image();     revue01on.src = "../images/gif/btn01on.gif";
             revue00on = new Image();     revue00on.src = "../images/gif/btn00on.gif";
             revue99on = new Image();     revue99on.src = "../images/gif/btn99on.gif";
             revue98on = new Image();     revue98on.src = "../images/gif/btn98on.gif";
             revue97on = new Image();     revue97on.src = "../images/gif/btn97on.gif";
             revue9xon = new Image();     revue9xon.src = "../images/gif/btn97on.gif";

             revue02off = new Image();    revue02off.src = "../images/gif/btn02off.gif";
             revue01off = new Image();    revue01off.src = "../images/gif/btn01off.gif";
             revue00off = new Image();    revue00off.src = "../images/gif/btn00off.gif";
             revue99off = new Image();    revue99off.src = "../images/gif/btn99off.gif";
             revue98off = new Image();    revue98off.src = "../images/gif/btn98off.gif";
             revue97off = new Image();    revue97off.src = "../images/gif/btn97off.gif";
             revue9xoff = new Image();    revue9xoff.src = "../images/gif/btn97off.gif";
}
    function TurnOn(BtnName) {
            if (document.images) {
                document[BtnName].src = eval(BtnName + "on.src");
            }
    }

    function TurnOff(BtnName) {
            if (document.images) {
                document[BtnName].src = eval(BtnName + "off.src");
            }
    }