Can helper('html') be used with a single_page?

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If I want to load some js on a single page, can this be done with helper('html')? If so, where would I place the js and how should it be named?

And maybe I am not approaching the problem correctly: I want to include a custom tinyMCE.init while using the built-in tinyMCE.

Suggestions welcomed...

Todd

rtcary