发送ajax请求时出现问题

My problem is I got 2 link call the same function, but in first link I can see ajax request in firebug(run fine) but in second query, my ajax totally won't show in firebug(request won sent out) and alert me 0,error,undefined.

However I already try both of my link, its valid and can be surf.

HTML

<a onclick="friend_act(url3)">test</a>
<a onclick="friend_act(url4)">test2</a>

JS

function friend_act(url2){
$.ajax({
   type: 'POST',
   url:url2,
   data: {ao:1,msg:1},
   dataType: 'json',
   beforeSend: ShowLoading,
   success: function(resp){
       $('#theLoading').dialog('close');
       $('#loading').html('');
       //add friend

   },
    error:function(xhr, ajaxOptions, thrownError){
       alert(xhr.status);
        alert(ajaxOptions);
                alert(thrownError);
       $('#theLoading').dialog('close');
       $('#loading').html('');
    }
 });
}

i simplified your problem. here is a working example. Maybe this can get you goiing..

http://jsfiddle.net/SjE7f/

Remember that the browser does not allow you cross domain requests.
If your URL points out of your domain, the request will be disabled.