I am using the following code but I am unable to retreive the user id.

function userIdrequest() {
    var params = {};
    params[opensocial.DataRequest.PeopleRequestFields.PROFILE_DETAILS]
= [opensocial.Person.Field.PROFILE_URL];
    var req = opensocial.newDataRequest();
    req.add(req.newFetchPersonRequest("VIEWER", params), "viewer");
    req.send(userIdresponse);
  };

          function userIdresponse(data) {
                var viewer = data.get("viewer").getData();
                var profile_url =
viewer.getField(opensocial.Person.Field.PROFILE_URL);
                var regex = /uid=([^&#]+)/;
                var result = profile_url.match(regex);
                if (result.length == 2) {
                   var uid = result[1];
                   return uid;
                    /* uid now contains the viewer's orkut UID */
                } else {
                  /* there was a problem getting the UID */
                }

          };


function addMovie(myMovieId,linkId){
                var params = {};
                var uid = userIdrequest();
                var postdata = {
                                movieId : myMovieId,
                                userId : uid,
                                };
        params[gadgets.io.RequestParameters.METHOD] =
gadgets.io.MethodType.POST;
                params[gadgets.io.RequestParameters.POST_DATA] =
gadgets.io.encodeValues(postdata);
                var url = "http://myserver.com/addMovie";;
                gadgets.io.makeRequest(url, addMovieMsg, params);
}

But I am getting 0 as user id.
Please help me to solve this problem.
Thanq in advance


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