Bob, that is a very nice calculator with more useful info than the one I linked, but indeed, it lacks a pretty UI. On top of that, there are some bugs in the one I linked. (e.g. Poison Nova manages to list minimum damage above the maximum damage if you get it to a high enough level.)
I feel a little dirty because I prefer the pretty UI, and worry this portends I might become a Mac fan in the future. :-P
It's pronounced "See-Pee-Slow" :-P
Q u o t e: Or... we could just throw the baby and the bathwater into a volcano and then nuke the volcano.