PROBLEM

In IE7, many of Prototype's functions stop working when Prototype.js
is included twice. What is the best practice for shielding against
multiple loads of Prototype?

BACKGROUND

I'm creating a widget script people can embed on their websites. My
script uses Prototype. There's a possibility that their website may
already include Prototype. When Prototype is included a second time on
their site, IE7 will crap out saying "Object does not support this
property or method" on nearly any function call.

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