XF 1.4 Pages or Pop-ups

My site goes directly to the forum when you enter the url, the users like it that way. I would like to have some pages though. Is there an add-on that will let me integrate a page? or maybe even an overlay or pop-up page that would come up when someone clicks on a sidebar link? An overlay would be neat I think.

I am using UI.X also if that creates an option?