[Zope] parameters do not pass from form?

[WER3w0LF]

I installed ZOPE 2.5.1 for Win32 and I cannot receive parameters from
my form file as the following.

file testForm:
-------------
<dtml-var standard_html_header>
<form action="testAction" method="post">
<input type="text" name="parametr" />
<input type="submit" />
</form>
<dtml-var standard_html_footer>

file testAction:
-------------
<span tal:replace parametr>blah</span>

Whatever I write down as parametr in my form I receive only "blah".
Why my testAction cannot see variables from testForm?

-- 
Wer3W0lf
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