How can we send the logged in user id 

hi , first of all thanx for this code. i am using this library to implement a chat application , problem is how can i send the logged in user id when a user connects to socket with function 

Server.bind('open', function(data) 
            {
                var user='<?php echo CHtml::encode(Yii::app()->user->name); ?>';
                alert(data);
            });
