How to show last 10 topics on other webpages (only some categories.)

I want to show last 10 topics but separate the category.
(showing only one category at a time)

look at my code , what shall I do next ?

on http://ebay.fakjai.com/bbs/top20.php

<script src="jquery.js"></script>
<script>
// Include this script where you want to embed the latest 10 discussions.
// This script requires jQuery.

document.write('<div id="vn_discussions_popular"></div>');

jQuery(document).ready(function($) {
   var url = 'http://ebay.fakjai.com/bbs/discussions.json?page=1-10&callback=?';

   $.ajax({
     url: url,
     dataType: 'json',
     success: function(data) {
         var foo = 'bar';
         var result = '';

         for(i in data.Discussions) {
            d = data.Discussions[i];
            result += '<img src="http://ebay.fakjai.com/wp-content/themes/fakjai/images/PostBullets.png">&nbsp; <a href="'+d.Url+'">'+d.Name+'</a>&nbsp; โดย '+d.FirstName+'&nbsp; ( '+d.CountViews+' เข้าชม &nbsp;'+d.CountComments+' ความคิดเห็น  )  </img><br />';
         }

         result = '<ul>'+result+'</ul>';
         $('#vn_discussions_popular').html(result);
      }
   });
});
</script>