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If they don't want to turn on JS, then they'll go somewhere else either way. Personally my stance is it's your own stupid fault for requiring JS in the first place. But that's my opinion.
You'd have more luck just saying:
"To view this site properly please make sure you have JavaScript enabled in your browser. For help with this, click here >>"
[with a link to a simple page explaining how to actually do this in various browsers, with screenshots if you desire..]