Forumcache + output

[ragtek]

i need the code to output the forums with the right permissions in this form:

<ul>
  <li>Category 1
    <ul><li>forum1</li><li>forum22</li></ul>
  </li>
<li>category2
    <ul><li>forum4</li><li>forum15</li></ul>
</li>
</ul>