(function(){
    var showCopyRight = function(e){
        YAHOO.util.Event.stopEvent(e);
        this.style.visibility = "visible";
    }
    var closeCopyRight = function(e){
        YAHOO.util.Event.stopEvent(e);
        this.style.visibility = "hidden";
    }
    YAHOO.util.Event.onAvailable("copyright", function(){
       var copyright = $get("copyright_btn");
       YAHOO.util.Event.addListener(copyright, "click", showCopyRight, $get("copyright"), true);
       YAHOO.util.Event.addListener($get('closeCopyRight'), "click", closeCopyRight, $get('copyright'), true);
    });
})();