splice

Hi Guys

can u please tell me why the splice function doesn't work and how i can delete this entry out of the array?

application.onAppStart = function(){
    application.allowDebug = true;
       
   
    application.chat_so = SharedObject.get("chat_so", false);
    application.ar = new Array;
   

    application.onConnect = function( client, username ) {
        application.acceptConnection( client );
        client.cl_id = new String;
       
        client.addUser = function (u_data){
            client.cl_id = u_data;
            application.ar.push(u_data);
            application.chat_so.setProperty("hi", application.ar);
        }
    }
   
    application.onDisconnect = function(client){
        for (i = 0; i < application.ar.length; i++){
            if (client.cl_id == application.ar){
                application.ar.splice(i,1);
                application.chat_so.setProperty("hi", application.ar);
            }
        }
           
           
       
    }
}

Thanks a lot