Prototype: '$S is not defined'

I cannot use $S() says its undefined but prototype is installed

[kazisdaman3]

Anyone have any thoughts on this, noob question:

I'm trying to use the simplest of all functions.

$S()

, but it errors: $S is not defined

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in my head, I have prototype.js called already. any thoughts, this makes no sense... because it is declared in prototype.js isn't it?

Thanks for thoughts.

[Fotiman]

No, there is no $S() method defined in prototype.js (at least not in version 1.5.1.1).