Photoshop :: "enhance" An Image?

I work at a business that had something stolen from us. Via the security cameras we have the license plate, however it was zoomed pretty far and is therefore pretty pixelated. I'm wondering if anyone can help me sharpen it up. I know this isn't the movies and it doesn't just work like that, but I figure something should be able to be done.

I have tried unsharp mask, I have tried edge detect. I don't know a whole lot about photoshop though.

I know what state the license plate is which would pretty much be impossible to tell from the camera, I am just trying to figure out the actual plate.

If it's not against the rules of the forum, I can post a picture here. I saw the "request for work" thread but it said that I would have to pay and considering how the economy is on businesses right now that's just not possible. I'm really just looking for how to do it if no one can look at it for me.