I Have one Content page of Master Page

Source File for content page

---------------------------------------------------------------------------------------------------------------------------------

<%@ Page Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" Title="Untitled Page" %>

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<div>

<asp:TextBox ID="TextBox1" runat="server" Style="z-index: 100; left: 71px; position: absolute;

top: 152px">asp:TextBox><IMG src="smcal.gif" alt="Select Date" id="Img1" style="z-index: 100; left: 243px; position: absolute; top: 154px" />

<SCRIPT>

Calendar.setup({inputField : "TextBox1", ifFormat : "%d-%b-%Y", button : "Img1"});

SCRIPT>

div>

asp:Content>

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Master Page

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>

DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

<title>Untitled Pagetitle>

<LINK href="style.css" type="text/css" rel="stylesheet">

<LINK href="styleset.css" type="text/css" rel="stylesheet">

<LINK href="calendar-win2k-1.css" type="text/css" rel="STYLESHEET">

<script src="calendar.js" type="text/javascript">script>

<script src="calendar-en.js" type="text/javascript">script>

<script src="calendar-setup.js" type="text/javascript">script>

 

 

head>

<body>

<form id="form1" runat="server">

<div>

<asp:contentplaceholder id="ContentPlaceHolder1" runat="server">

asp:contentplaceholder>

div>

form>

body>

html>

But when i Clicked on the image of Calender it should display Calender but It gives error Null value or null reference .

This is only with master page but when i done same thing in simple default.aspx page it is working fine.

is there any way to write down below script different for Master Page

 

<SCRIPT>

Calendar.setup({inputField : "TextBox1", ifFormat : "%d-%b-%Y", button : "Img1"});

SCRIPT>

 

Please reply as soon as possible