Javascript Image Scroller Broke! Help

I am not exactly sure what has happened but when uploading and changing images I did something to make the scroller stop working. NOW it’s a big blank on the front page

ANY HELP?

Uncaught ReferenceError: addLoadEvent is not defined

Which means what? How do I fix?

Did that timed slideshow from JonDesign’s Smooth SlideShow Library?

I believe it did…the design was not created by myself but a programmer/design firm.

Was their final design broken too? And if so, shouldn’t they fix it?

This site was working correctly and I think someone was uploading a new image to the slider and did something and then everything didn’t work. I am trying to help out and find out what the problem is and how to fix it.

It looks like the script for the slideshow is loaded from:
http://www.simplewishes.com/slide/timed.js

and that file no longer exists. Did someone delete it, or move that file?