Panic Transmit - restore deleted local files

I've made a bit of a cock up with a website i've been developing, and being a bit new to all things Mac i've deleted some files.

Basically i've downloaded a copy of the website from the server to my local disc but the local copy also contained all my raw files PSD's etc. I didn't realise that transmit deleted the local copy before downloading and not merging them which is what most windows ftp software does.

Anyway, long story short, is there any way of restoring those files either via transmit or another bit of software ? preferably free ?

Any help appreciated.

Cheers,

Sponzie