Ok I see what you mean. This occurs because you're using the same ".selected" class to permanently highlight the menu item pertaining to the current page. What you should do is create a separate class for that, such as ".currentpage", which may merely be a duplicate of ".selected".
BTW, in FF2, there is a z-index issue with your drop downs causing them to disappear as soon as the mouse rolls over them. You should try moving the drop down menus' HTML to the very bottom of your page (right above the </body> tag):
Code:
<!-- Top Drop Down Menu 1 HTML -->
<ul id="ddsubmenu1" class="ddsubmenustyle">
<li><a href="topatec-unternehmen.html">Wir über uns</a></li>
<li><a href="kontakt.html">Kontakt</a></li>
</ul>
<!-- Top Drop Down Menu 2 HTML -->
<ul id="ddsubmenu2" class="ddsubmenustyle">
<li><a href="wasseraufbereitung.html">Wasseraufbereitung</a></li>
<li><a href="abwassertechnik.html">Abwasserbehandlung</a></li>
<li><a href="reinigungstechnik.html">Waschtechnik</a></li>
<li><a href="regenwassernutzung.html">Regenwassernutzung</a></li>
<li><a href="fettabscheider.html">Fettabscheider</a></li>
<li><a href="abscheidertechnik2.html">Benzinabscheider</a></li>
<li><a href="abscheidertechnik2.html">Koaleszenzabscheider</a></li>
</ul>
<!-- end navigation -->
</body>
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