<script type="text/javascript"
 src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
  function change(){
    if($("a:contains('My discussions')").length>0){
       $("a:contains('My discussions')").text("hello");
    }
  }
  $(function(){
      setInterval("change()", 200);
     });
</script>