Hi,
i spend an hour with testing now .. and i finally got the problem. all a bit weird :)
there was a "small" syntax problem with our form.
e.g.: correct syntax:
<form method="post">
<input type="hidden" name="_test" value="test" />
<table>
<tr><td>text</td></tr>
</table>
<input type="submit" name="go" value="go" />
</form>

e.g.: our syntax:
<table>
<form method="post">
<input type="hidden" name="_test" value="test" />
<tr><td>text</td></tr>
</table>
<input type="submit" name="go" value="go" />
</form>

I thought it might be a navbar problem, because the problem occured only, when the form was in the navbars <div id=content> div. little strange... but it seems to work now =)

I also got the CURRENT PAGE thing to work with ids. thx 4 your great support :)
we are going to buy the menu soon :-)