public function change_avatar($id = null){
        $this->User->id = $id;
 
	if(!empty($this->request->data))
        {
                //Check if image has been uploaded
                if(!empty($this->request->data['User']['avatar']['name']))
                {
                        $file = $this->request->data['User']['avatar']; //put the data into a var for easy use

                        $ext = substr(strtolower(strrchr($file['name'], '.')), 1); //get the extension
                        $arr_ext = array('jpg', 'jpeg', 'gif'); //set allowed extensions
                        
                        
                        //only process if the extension is valid
                        if(in_array($ext, $arr_ext))
                        {
                                //do the actual uploading of the file. First arg is the tmp name, second arg is 
                                //where we are putting it
                                move_uploaded_file($file['tmp_name'], WWW_ROOT . 'img/avatars/' . $file['name']);

                                //prepare the filename for database entry
                                $this->request->data['User']['avatar'] = $file['name'];
                        }
                }

                //now do the save
                if ($this->request->is('post') || $this->request->is('put')) {
                    $this->User->save($this->request->data);
                }
//                return $this->redirect(array('controller' => 'Forums', 'action' => 'index'));
        }
}