Accordion Menu for Opencart

Offer me some guidance and make some changes to an already functioning accordion menu on an opencart store. [login to view URL] Menu on left side works well but now that the body of the page updates with each click on the menu the animation effect is no longer working. I would like the refresh of the body of the page to be done by ajax if possible, or somehow have the accordion animate as well as redrawing the page to display items and subcategories at at hat level. Please include some small detail in your reply about what you think is the best way to fix this. Thanks Murray