Doesn't work right on my MacBook with FireFox 3.0.10. There is nothing special about my setup, except for the fact that my dock is currently at the bottom and not on auto-hide - surely not uncommon, being the default and all, even though I like hiding it when doing serious hacking.

In any case, you can't assume a minimum resolution when designing a website. At the very least, give lower resolution users the option of scrolling.