Rails - May 2009 - Problem with TEH's format buttons acting as submit button

I have a strange problem with Textile Editor Helper.

I have installed what is needed to work and my textarea is being
''textilized'' (as I write Textile markups directly by hand).

However, when I click on any of the format buttons, bad surprise
appears: they act just as "submit" buttons! I have been trying to cut
some parts of code linking prototype as the only library, etc. - nothing
helps.

What could be the reason of such behaviour?
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