Rating System Stopped Working

I'm not sure what I did, but the photo and profile rating system stopped working on my site. The rating "stars" are there and nothing has changed in the lay-out but when I (and I'm assuming my site members) click a star to rate a photo or profile, the vote is not added. Also in the "Photo Rating" function (rate.php), the photos are displayed, and when a star is clicked to assign a rating, the next photo is displayed but the new rating isn't added to the previous photo. Am looking for someone who can fix this so that it is working again.