<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>

    <script type="text/javascript">

        var style;

        var Clickedindex = 0;

        var mouseoverRowColor = "#dadada";
        var oddRowColor = "#ecf5ff";
        var evenRowColor = "#ffffff";
        var selectedRowColor = "yellow";
        $(document).ready(function() {

            $('[id*=GridView1] tbody tr+tr:even').mouseover(function() {
                if ($(this).index() != Clickedindex || Clickedindex == 0) {
                    $(this).removeAttr("style");
                    $(this).css("background-color", mouseoverRowColor);

                }
            }).mouseout(function() {
                if ($(this).index() != Clickedindex || Clickedindex == 0) {
                    $(this).css("background-color", oddRowColor);
                }
            });
            $('[id*=GridView1] tbody tr+tr:odd').mouseover(function() {
                if ($(this).index() != Clickedindex || Clickedindex == 0) {
                    $(this).removeAttr("style");
                    $(this).css("background-color", mouseoverRowColor);
                }
            }).mouseout(function() {
                if ($(this).index() != Clickedindex || Clickedindex == 0) {
                    $(this).css("background-color", evenRowColor);
                }

            });
            $('[id*=GridView1] tbody tr+tr').click(function() {
                if (Clickedindex % 2 == 0 && Clickedindex != 0) {
                    $("tr:eq(" + Clickedindex + ")").css("background-color", evenRowColor);
                }
                else if (Clickedindex % 2 != 0 && Clickedindex != 0) {
                    $("tr:eq(" + Clickedindex + ")").css("background-color", oddRowColor);
                }
                $(this).removeAttr("style");
                Clickedindex = $(this).index();
                $(this).css("background-color", selectedRowColor);
            });

        });


    </script>
Plz Just try this the issue is with the new jquery and let me know

<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.5.js" type="text/javascript"></script>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>