I may need to do a file upload system soon, however I'm a bit stumped on how I'll be doing the live upload status. You know - the percentage complete part?

Any suggestions on this?

From php 5.2 there is some kind of ability to ask server about upload details for certain upload process. Google for "upload progress php", there are many examples.

I don't think that this can be done in php.
You may should search for php with Ajax .

OMG. If you just open the progress checking script inside the constantly refreshing iframe you may get this done without a single string of javascript.