How insert h2 in category list

How insert <h2> the category list?

I have insert a code manualy : collapsCat(‘animate=1&linkToCat=0&showPosts=0&showTopLevel=0&showPostCount=0&inExcludeCats=Media&expandCatPost=1&expand=4’);

but i need that a title of category and subcategory show in <h2> tag.

-<h2>products 1</h2>
<h2>sub-product1</h2>
-<h2>products 2</h2>
<h2>sub-product2></2>

now is :
-products 1
sub-product1
-products 2
sub-product2

Thanks for a support