Unity 3D Mutiplayer Script

//Network Mutiplayer Script developed by Jordan over at https://twitter.com/SecurityAnalyst
//Unity 3D

var playerPrefab:GameObject;
var spawnObject:Transform;
var gameName:String = "CGCookie_Tutorial_Networking";

private var refreshing:boolean;
private var hostData:HostData[];

private var btnX:float;
private var btnY:float;
private var btnW:float;
private var btnH:float;

function Start(){
    btnX = Screen.width * 0.1;
    btnY = Screen.height * 0.1;
    btnW = Screen.width * 0.2;
    btnH = Screen.width * 0.2;

}

function startServer(){
    Network.InitializeServer(32, 25001,  !Network.HavePublicAddress);
    MasterServer.RegisterHost(gameName, "Tutorial Game Name", "Tutorial Game Name");
}

function refreshHostList(){
    MasterServer.RequestHostList(gameName);
    refreshing = true;
}

function Update(){
   if(refreshing){
       if(MasterServer.PollHostList().Length > 0){
           refreshing = false;
           Debug.Log(MasterServer.PollHostList().Length);
           hostData = MasterServer.PollHostList();

       }

   }

}

function spawnPlayer(){
    Network.Instantiate(playerPrefab, spawnObject.position, Quaternion.identity, 0);
}


//Message
function OnServerInitialize(){
    Debug.Log("Server initialzed!");
    spawnPlayer();
}
function OnConnectedToServer(){
    spawnPlayer();
}


function OnMasterServerEvent(mse:MasterServerEvent){
    if(mse == MasterServerEvent.RegistrationSucceeded){
        Debug.Log("Registered Server!");

    }
}

//gui
function OnGUI(){
    if(Network.isClient && !Network.isServer){
    if(GUI.Button(Rect(btnX, btnY, btnW, btnH), "Start Server")){
       Debug.Log("Starting Server");
       startServer();
     }


    if(GUI.Button(Rect(btnX, btnY * 1.2 + btnH, btnW, btnH), "refresh Host")){
       Debug.Log("refreshing");
       refreshHostList();
    }

    if(hostData){
        for(var i:int = 0; i <hostData.length; i++){
            if(GUI.Button(Rect(btnX *1.5 +btnW, btnY*1.2 + (btnH * i), btnW*3, btnH*0.5), hostData[i].gameName);
               Network.Connect(hostData[i]);
            }
         }
        }
    }
 }