<script language="JavaScript" type="text/javascript" src="./js/jq.js"></script>
    <script language="javascript" type="text/javascript" src="./js/json2.js"></script>


          $.ajax({
                url:"./ajax/aj_cate.php",
                success:function(data)
                        {
                            alert (data);
                            alert (JSON);
                            var x=JSON.parse(data);
                            alert (x);
                            $("#tab table").append(
                       "<tbody><tr><td>csss</td></tr></tbody>"
                       );
                          }
               });