KompoZer looks like a branch of the discontinued Nvu, which I've used before and has been pretty good. You may also want to try Amaya, although KompoZer looks more user-friendly. I imagine that one of the computers at Emmet Till has Microsoft Office, so you could even try Microsoft FrontPage.

Let me know what you choose, or if you need more help!
Thanks,
Ben (Stationed at Canter Middle School)