Seek utility to find undefined classes and IDs

I'm looking to find a utility that shows which orphaned (CSS) classes or ids. Google lead me to a thread that ended up recommending TopStyle (http://www.highdots.com/forums/cascading-style-sheets/any-utility-list-undefined-css-188405.html).

I can a开发者_开发知识库fford the $70 - anyone have a better recommendation?

thx

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Ha, actually this was in my RSS reader today. Odd timing. Helium seems to be a JavaScript tool for doing just this. Normally I wouldn't recommend a javascript-based tool for this, but if you don't find anything else give it a go.