How to load pages in same browser window (using AJAX?)

I’m trying to fit a concept to a theme, as it were. A city guide where you have a big map with business points. When you hover over a point, you see quick info about the business. When you click the point, you get a more detailed profile page about the business. For this purpose, City Guide from WooThemes looks great.

But part of the concept is to make this a “one window” experience for the end user, so you don’t actually browse from page to page. I’m wondering if there is quick n’ easy way to load an attraction’s details (eg load another WordPress Page) just underneath the big google map on the homepage rather than browsing to its dedicated page.

Perhaps the solution is to use gasp frames! Or maybe someone has built this kind of functionality into a plugin.