template tag questions

how customisable are the template tags? the get_links_list function gives an output like:

<li id="linkcat-1"><h2>Blogroll</h2>
<ul>
<li><a href="http://example1.com/">Blogroll Link 1</a></li>
<li><a href="http://example2.com/">Blogroll Link 2</a></li>
<li><a href="http://example3.com/">Blogroll Link 3</a></li>
</ul>
</li>

but i’d like to make it <h3> instead of <h2>