I had XF's default style set as default while I work on my newest add-on, I just set the style to my Icewind Dale style (it's not finished, so no commenting on it), so you can see the hit-point bar under the six online members area located under the map. The bar is normally white for "healthy" members characters, and shrinks as they take damage. It goes green at 75%, yellow at 50%, orange, red, and then black (dead). A bar like this is what you are looking for?
What are you basing experience on? When I finish with my newest add-on I'll be working on my experience points add-on. That, I won't release as it took me a while to figure out, and then fine-tune, how to award experience points based on post quality, and random encounters so that characters may level at the same rate as D&D suggests, but penalizes those whose posts were not all that, well... good. I may release a modified version based on criteria you need, depending on what it is.
My development/role playing-site-to-come:
www.icewinddalerp.com