Creating default text for textbox

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <style type="text/css" >
        .defaultText
        {
            font-style:italic;
            color:#CCCCCC;
        }
    </style>
    <script type="text/javascript" src="../js/jquery-1.4.2.min.js"></script>
    <script type="text/javascript">
        $(document).ready(
        function () {
            var searchBox = $('#<%= txtSearch.ClientID %>') //retrieve textbox control using its clientid
            searchBox.focus(function () {
                if (searchBox.val() == this.title) {  //On the focus event, check if it contains the default text
                    searchBox.removeClass("defaultText");//If yes, then remove the defaultText css style
                    searchBox.val(""); //clear the search field
                }
            });
            searchBox.blur(function () {
                if (searchBox.val() == "") {//On the blur event, check if the TextBox is empty
                    searchBox.val(this.title); //If yes, then attach the "defaultText" css style
                    searchBox.addClass("defaultText"); //Add the default information text to the search field
                }
            });
            searchBox.blur(); //Call the blur event on page load so that the TextBox is initially out of focus
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:TextBox ID="txtSearch" runat="server" Width="200px" CssClass="defaultText" ToolTip="Enter your search key work"></asp:TextBox>
        <asp:Button ID="btnSearch" runat="server" Text="Search"  />
    </div>
    </form>
</body>
</html>
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