binding a function to html element in jquery

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Javascript

jQuery

ASP.NET4

code $(this._element).append('<input type="button" value="close" onclick="'+obj+'.quit('+obj._roomid+');"/>');
is not working .how can i call function quit when pressing button close in below code

Box.prototype = {
    get_title: function () {
        return this._title;
    },
    set_title: function (val) {
        this._title = val;
    },
    get_roomid: function () {
        return this._roomid;
    },
    set_roomid: function (val) {
        this._roomid = val;
    },
    open: function (RoomId, RoomName) {
        if ($.inArray(RoomId, lockBox) == -1) {
            this._roomid = RoomId;
            this._title = RoomName;
          
            this._element = document.createElement("DIV");

            this._element.style.display = "none";
            this._iframe = document.createElement("IFRAME");
            this._iframe.src = "chatbox.aspx?i=" + RoomId;
            this._iframe.style.width = "800px";
            this._iframe.frameBorder = 0;
            this._iframe.style.height = "360px";
            this._iframe.scrolling = "no";
            this._element.appendChild(this._iframe);

            document.body.appendChild(this._element);
           
            $(this._element).append('<input value="close"  type="button" onclick="'+obj+'.quit('+obj._roomid+');"/>');
            var obj = this;
           
             $(this._element).show();
            lockBox.push(RoomId);
            $addHandler(window, "unload", function () {
                obj.quit(obj._roomid);
            });
            $("#_cu_" + RoomId).html(Number($("#_cu_" + RoomId).html()) + 1);
        }
        else {
            ShowMessageBox("Exception", "You have joined the chat room");
        }
    },
    quit: function (roomid) {
        ShowMessageBox("Leave Chat Room", "Please waiting...");
        csaspnetajaxwebchat.transition.LeaveChatRoom(roomid, function () {
            lockBox = $.map(lockBox, function (n) {
                return n != roomid ? n : null;
            });

            $("#_cu_" + roomid).html(Number($("#_cu_" + roomid).html()) - 1);

            CloseMessageBox();
        });

    },
    test: function (roomid) {
        alert(roomid);
    }
}