Why are plugins not working at the same time?

Why are plugins not working at the same time?

I'm fairly new to this, and the answer might be death simple. I downloaded a pack for a "featured content slider" and it works perfectly. This is what it contained:

http://www.emilhuovinen.com/js/coda-slider.1.1.1.pack.js

http://www.emilhuovinen.com/js/ycodaslider-2.0.pack.js

http://www.emilhuovinen.com/js/jquery-easing-compatibility.1.2.pack.js

http://www.emilhuovinen.com/js/jquery-easing-1.3.pack.js

(Do I need all of them?)

And then the real problem:

When I add http://www.emilhuovinen.com/js/experiment.js none of the plug-ins work. Why, and can this be fixed?

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