First step was to verify that the slideshow content was indeed being output to the final HTML. After verifying this, I moved on to the one JavaScript error being displayed:
Uncaught Error: Syntax error, unrecognized expression: a[href$=.mp3]
A quick Google on the full error seemed to confirm suspicion that this error was killing the rest of your site's JavaScript, and thus causing your slideshow to not work.
So the idea now (without being able to see all your installed plugins) was, you had some plugin that was installed to playback MP3 files. So that's where I pointed you for a possible fix. The link above provided a potential fix for an installed plugin causing this issue, but simply installing a new audio player was another valid, and less technical, solution.
I was only able to help you by actually seeing the site, that would have likely been pertinent information to provide to get additional feedback from the community.
Glad you got it resolved!