Error in msdn chat application : Type, csaspnetajaxwebchat is undefined

hi , i am trying to create a chat appln and i have downloaded the code from code .msd.com http://code.msdn.microsoft.com/CSASPNETAJAXWebChat-c4c9b8fe but when i am trying to run the appln am getting few errors, can anyone help to get a error free chat appln error in Module Name: chatRoom.js // Get chat room list function fuGetRoomList() { ShowMessageBox("Getting chat room list...", "Getting chat room list..."); csaspnetajaxwebchat.transition.GetChatRoomList(fuGetRoolListOnSuccessCallBack, ajaxErrorCallBack); } //error in the above line : csaspnetajaxwebchat is undefined. i have referred corectly in the .aspx file. microosft. jscript runtime error: "Type" is undefined: Type.registerNamespace('WebChat'); WebChat.ChatBox = function () { WebChat.ChatBox.initializeBase(this); this._title = ""; this._iframe = null; this._element = null; this._roomid = null; } }