li ul in the sidebar problem

i have a old theme for a older version of wordpress and i added a 2nd sidebar and it shows by default li and ul for the titles of the widgets how do i remove the li ul before the widgets
i’m running it on the latest version of wordpress
code looks like this

<div id="sidebar2">
<li id="tag_cloud-2" class="widget widget_tag_cloud">
<h2 class="widgettitle">Tags</h2>
<div>....the tag links</div>
</li>
</div>