Search form for Photos

Hi everyone… I’m fairly new to wp but I was wondering if anyone knows of a plugin that enables visitors to search, using keywords, photos on a blog/site.
I have a sort of stock photography website and up so far I have published static pages containing albums divided into themes but waht would be absolutely useful for my visitors/clients is to go onto a “serach photo” page and type in keywords, displaying then an album containing photos corresponding to those infos. In the manage gallery page, each photo inside each gallery has keywords so I thought there must be a good way to use that information inside the blog / site.

Thanks.
David