How do I upload data alongside my image upload?

How do I upload additional variables alongside an image upload? My code doesn't seem to be working.

                    temp.upload(new URLRequest(serverURL));

                    var variables:URLVariables = new URLVariables();

                              variables.my_name = "Jackson" ;

                              variables.my_state = "Missisippi" ;

                    var request:URLRequest = new URLRequest(serverURL);

                    request.method = URLRequestMethod.POST;

                    // Put parameters into request.data

                    request.data = variables;

                    // Perform the upload

                    temp.upload(request);

Thanks!