Tomorrow morning I'm interviewing for a web development internship position and I'm seeking general advice pertaining to the questions that interviewers might ask, some questions I should ask them during the interview, and any general tips/suggestions that might help.

They're looking for someone with knowledge mainly in HTML/CSS, Joomla, MySQL and PHP, all of which I have excluding Joomla (which I'm installing/doing as much research on as possible at the moment) and I was able to provide them a link to a site I'd been paid to build for a small business which they mentioned they were impressed with.

I'd like to prepare myself for the interview as much as I possibly can but I'm wondering how much time I should spend rehashing elements of the languages they're looking for, or if it'd be a better use of my time to research their company and figure out how I'd respond to general questions.

I feel that perhaps because I showed them a project I've completed that they'll know that I can grasp the technical side of what they're going for... but this is my first internship interview in this field so I'm not exactly sure what to expect.

Thanks