Code issue, not showing on website.

if($('#twitter_box').length){
        var yourTwitterUsername = "fishydesigns"; 
         $.ajax({
            url : "http://twitter.com/statuses/user_timeline/"+yourTwitterUsername+".json?callback=?",
            dataType : "json",
            timeout: 15000,
            
            success : function(data){
                var list = $("<ul class='tweet_list'>");
                for (i=0; i<4; i++){
                    list.append("<li>" + data[i].text.replace(/((https?|s?ftp|ssh)\:\/\/[^"\s\<\>]*[^.,;'">\:\s\<\>\)\]\!])/g, function(url){
                                return '<a href="'+url+'" target="_blank">'+url+'</a>'}) + "</li>");
                }
                $("#twitter_box").html(list);
                $(".oneOfThree, .twoOfThree").adjustHeight();
            },
        
            error : function(){
                $("#twitter_box").html("There was an error connecting to Twitter");
                $(".oneOfThree, .twoOfThree").adjustHeight();
            }