Separate Scrolling for Aha! Ideas Portal

When you have many categories for Aha! Ideas, you get a list that is scrollable. However, the list of categories and the list of ideas content are scrolled together and when you filter on a category by picking it from the list on the left, it refreshes the content and takes you to the top of both lists. The two lists should be independently scrollable so that you can quickly move through the categories.