How would you do this?

Hi Guys,

Im working on a site for a client.

They’ve fallen out with there current design firm - who wont let them use the current HTML/CSS code (though the client owns the visuals).

Im a PHP developer so recoding the sites HTML is daunting to say to the least given my time scale - so how would you deal with this?

Im tempted to just adjust class names but im not sure how ‘cheeky’ this would be?!

What have you guys done faced with this in the past?