js delay

                if(typeof(timer) != "undefined") {
                    clearTimeout(timer);
                }
                if(this.getOpt('delaytime') > 0) {
                    var callback,_this = this;
                    callback = function() {
                        return _this.executecallback(key.text);
                    };
                    timer = setTimeout(callback, this.getOpt('delaytime'));
                }else {
                    this.executecallback(key);
                }