How To Change Gridview Row Color on Mouseover using css and Javascript

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Alternate.aspx.cs" Inherits="Alternate" %>

<!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 Page</title>

    <style type="text/css">

    .datatable tr:hover,.datatable tr.hilite

    background-color: #DFE7F2;

    color: #000000;

    </style>

</head>

<body>

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

        <div>

            <asp:GridView ID="GridView1" runat="Server" CssClass="datatable">

            </asp:GridView>

        </div>

    </form>

    <script type="text/javascript">

    var rows = document.getElementsByTagName('tr');

    for (var i = 0; i < rows.length; i++) {

    rows[i].onmouseover = function() {

    this.className += ' hilite';

    rows[i].onmouseout = function() {

    this.className = this.className.replace('hilite', '');

    </script>

</body>

</html>

using System;

using System.Data;

using System.Configuration;

using System.Collections;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

public partial class Alternate : System.Web.UI.Page

    protected void Page_Load(object sender, EventArgs e)

        if (!IsPostBack)

            GridView1.DataSource = GetCustomMadeDataTable();

            GridView1.DataBind();

    public DataTable GetCustomMadeDataTable()

        //Create a new DataTable object

        System.Data.DataTable objDataTable = new System.Data.DataTable();

        //Create three columns with string as their type

        objDataTable.Columns.Add("ISBN", typeof(string));

        objDataTable.Columns.Add("Title", typeof(string));

        objDataTable.Columns.Add("Publisher", typeof(string));

        objDataTable.Columns.Add("Year", typeof(string));

        DataColumn[] dcPk = new DataColumn[1];

        dcPk[0] = objDataTable.Columns["ISBN"];

        objDataTable.PrimaryKey = dcPk;

        objDataTable.Columns["ISBN"].AutoIncrement = true;

        objDataTable.Columns["ISBN"].AutoIncrementSeed = 1;

        //Adding some data in the rows of this DataTable

        DataRow dr;

        for (int i = 1; i <= 5; i++)

            dr = objDataTable.NewRow();

            dr[1] = "Title" + i.ToString();

            dr[2] = "Publisher" + i.ToString();

            dr[3] = "200" + i.ToString();

            objDataTable.Rows.Add(dr);

        Session["strTemp"] = objDataTable;

        return objDataTable;

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