Document Ready Function not working in Content Pages of ASP.NET

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

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
    <script src="Scripts/jquery-1.4.3.min.js" type="text/javascript">

        $(document).ready(function ()
        {
            $('#<%= GridView1.ClientID %> tbody tr').mouseover(function()
            {
                $(this).addClass('highlightRow');
            }).mouseout(function ()
            {
                $(this).removeClass('highlightRow');
            }).click(function ()
            {
                $(this).toggleClass('selectedRow');
            });

        }); 
        
    </script>

</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
    <asp:GridView ID="GridView1" runat="server" BackColor="White"  Font-Size="10" Font-Names="Verdana" 
            BorderColor="#000000" BorderStyle="Solid" BorderWidth="1px" CellPadding="3" 
            Width="400px" CellSpacing="0" GridLines="Horizontal" SkinID="gridviewSkin" >
        </asp:GridView>
</asp:Content>