wordpress widget - adding custom class?

Question

I have a custom menu for my "main-nav" in wordpress.

Using widgets I added the "main-nav" to the footer as well. My problem is that the class definitions for the two different ul are different.

Main Nav 1 = the ul has a class="sfmne"

Main Nav 1 = the ul has a class="menu"

I would like them to have the same class name or at least have a class name in common, making styling easier.

I found a jwuery function addclass() as a last resort, but feel like there should be a more direct solution, after all how had would it be to add a class to a menu?