What's the site made from?
Depending on the set up it could be easier than you think to update it yourself.
Outline what you need exactly so that you can get a more detailed response.
If you're dead set against doing it yourself try this lady:
[broken link removed]
I was working on a site and was having problems with rolling images, I contacted Maura about a site she had created that incorporated rolling images and she was more than willing to help me out.
I've no connection with her and have never actually met her but from my limited dealings with her I have found her to be straight up.
No harm contacting her, detailing your requirements and getting a price from her.