thttpd, <form>

[greengreen]

hi,
my problem is that doesn't work any form of xhtml
<form action="index.php" method="post">
<div>
<label for="heslo">Heslo:</label>
<input id="heslo" name="heslo" type="password" value="" />
<input type="submit" name="prihlasit_se" value="Prihl&#225;sit se" />
</div>
</form>

It is runiing only in IE but no opera, mozzila,seamonkey and on other webserver is running.
have anybody idea how to fix it?
thx very much

(or is anywhere exact tutorial for lighttpd + php5)here any does't works