asp.net使用jquery实现搜索框默认提示功能

%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Web.Default" %>

!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>/title>
    script src="jquery-1.8.2.min.js" type="text/javascript">/script>
    link href="Base.css" rel="stylesheet" type="text/css" />
    style type="text/css">
        .text
        {
            border: #0a8fda solid 1px;
            color: #cccccc;
            font-style:italic;
            background: #fff url(img/input.gif);
            padding: 5px;
        }
        .text-focus
        {
            border: solid 1px #f50;
            background: #fff url(img/input.gif);
            padding: 5px;
        }
    /style>
    script type="text/javascript">
        $(document).ready(function () {
            var txtSearch = $("#%=txtSearch.ClientID%>");

            $("#txtSearch").focus(function () {
                if (txtSearch.val() == this.title) {
                    txtSearch.val("");

                    this.className = "text-focus";
                }
            });

            $("#txtSearch").blur(function () {

                if (txtSearch.val() == "") {
                    txtSearch.val(this.title);
                    this.className = "text";
                }
            });
            txtSearch.blur();
        });

    /script>
/head>
body>
    form id="form1" runat="server">
    div style="margin: 100px auto; width: 400px; height: 80px;border: solid 1px #0a8fda;">
        p style="text-align:center;">
            asp:TextBox ID="txtSearch" runat="server" Width="200px" class="text" ToolTip="请输入搜索的关键字">/asp:TextBox>
            asp:Button ID="btnSearch" runat="server" Text="搜索" class="button blue" />
        /p>
    /div>
    /form>
/body>
/html>