It's hard to tell track down the issue as is, since most likely the culprit is due to some CSS on that page. Just to isolate the issue, try moving the sub menu DIVs to the bottom of the page, and also remove the part in red below:
Code:
<div id="pod">
<div id="sc1" class="tabcontent"><a href="historia.html">Historia zespołu</a> <a href="czlonkowie.html">Członkowie</a> <a href="dyskografia.hmtl">Dyskografia</a> <a href="boxsety.html">Boxsety</a> <a href="solowe">Płyty solowe</a> <a href="./filmografia/">Filmografia</a> <a href="obrazy.html">Obrazy Tico</a> <a href="sprzet.html">Sprzęt</a> <a href="producenci.html">Producenci</a></div>
<div id="sc2" class="tabcontent">xgfd</div>
<div id="sc3" class="tabcontent">sdfew</div>
<div id="sc4" class="tabcontent">sdfdssdf</div>
</div>
Do the sub menus appear now (albeit at the bottom of the page)?
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