Sidebar Widgets php

Hello,

I use the Sidebar Widgets in wordpress 2.2. I add the “text” box in the sidebar and put the following in the text box:

<div class="dbx-content">

<ul>
              <li class="rss"><a>">Entries (RSS)</a>
              <li class="rss"><a>">Comments (RSS)</a>
          </ul>
        </div>

But it seems that it can’t exe the php.

Is it mean text in Sidebar Widgets can’t exe php? Am I need to install a sidebar plugin which can exe php? Thanks.