Gridview row hover alert rowindex

on hover Gridview row, show row index as alert message

write onmouseover on rowdatabound

protected void mygridview_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowIndex != -1)
{
e.Row.Attributes["onmouseover"] = "showContents('" + (e.Row.RowIndex + 1) + "')";
}

}

 <script type="text/javascript">
        function showContents(rowIndex) {

            var gv = <%= mygridview.ClientID %>;
            var rowElement = gv.rows[rowIndex];
            var title = rowElement.cells[0].innerHTML;
            alert(rowIndex + ',' + title);

}