Add the new Custom Menu support to existing Wordpress Theme

This is a very simple quick project. I just need custom menu support added to my exisiting wordpress theme. I purchase this theme prior to Wordpress 3.0 and I need the new custom menu feature supported by my theme. I am currently hard coding menus on one of the sidebars and i want to use the new custom menu feature that was added in Wordpress 3.0. I will supply my current theme in a zip file and I just need the custom menu support added to the page template and functions file.