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Jquery error: Object expected
<head runat="server">
<title></title>
<script src="//Scripts/jquery-1.4.1.js" type="text/javascript"> </script>
<script type="text/javascript">
    $(document).ready(function () {
        $("#divGridView table tbody tr").mouseover(function () {
            $(this).addClass("highlightRow");
        }).mouseout(function () { $(this).removeClass('highlightRow'); })
    });
</script>
</head>
<body>
<form id="form1" runat="server">
<div id="divGridView">
 <asp:GridView ID="gvOpenSII" runat="server">
 </asp:GridView>

<script src="/Scripts/jquery-1.4.1.js" type="text/javascript"> </script>

<script src="Scripts/jquery-1.4.1.js" type="text/javascript"> </script>

$(function(){
    $('table tr').bind('mouseenter mouseleave',function(){
        $(this).toggleClass('highlightRow');
    });
});