iam in world and icannot move using tha mouse or tha keyboard and imusing firefox latest

I'm using Firfefox 3.0.7 at this very moment. Here, it works.

Check out:
- that you have "focus" In the world (there's a text there saying if the world has focus or not);
- if you're still able to click on the arrows;
- if you're clicking an 'allowed' arrow;
- finally, shall all of this fail, close all browser windows and start Firefox again.

yes ive tried everything and ive restarted my computer twice tha problem arised around 4 in tha morning gmt out of nowhere it was working fine all night then ijuss couldn move in firefox

Hmm most weird, Hero. I don't know what could be wrong, if you say you've even restarted the PC. Again, here it works.

But does clicking on the arrows at least work?

ARe you running a nightly build  or normal stable version?

I suggest that you make sure Javascript is enabled and clear your browser's cache.