Navigation --> Falsche Anzeige in IE6

[Anita]

Zum Ansehen des Menüs:
http://www.esa-at.at/esa/

stichworte: invalider code, quirksmode und box-model-bug

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Hallo,
also das ist das Menü im HTML-Quelltext:
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<!-- Menu bar #1. -->

<div class="menuBar" style="float:right;width:57em;">
<a class="menuButton"
    href=""
    onclick="return buttonClick(event, 'menu1');"
    onmouseover="buttonMouseover(event, 'menu1');">

START</a>
<a class="menuButton"
    href=""
    onclick="return buttonClick(event, 'menu2');"
    onmouseover="buttonMouseover(event, 'menu2');">
UNTERNEHMEN</a>
<a class="menuButton"
    href=""
    onclick="return buttonClick(event, 'menu3');"
    onmouseover="buttonMouseover(event, 'menu3');">
LEISTUNGSSPEKTRUM</a>
<a class="menuButton"
    href=""
    onclick="return buttonClick(event, 'menu4');"
    onmouseover="buttonMouseover(event, 'menu4');">
PRODUKTE</a>
<a class="menuButton" href="impressum.html" target="_self">IMPRESSUM</a>
<a class="menuButton"
    href=""
    onclick="return buttonClick(event, 'menu6');"
    onmouseover="buttonMouseover(event, 'menu6');">
KONTAKT</a>
</div>

<!-- Main menus. -->

<div id="menu1" class="menu">
<a class="menuItem" href="index.html" target="_self">Deutsch</a>
<a class="menuItem" href="#">English</a>
<a class="menuItem" href="#">Rom&acirc;n&atilde;</a></div>

<div id="menu2" class="menu">
<a class="menuItem" href="aktuelles.html" target="_self">Aktuelles</a>
<a class="menuItem" href="team.html" target="_self">Team</a>

<a class="menuItem" href="geschichte.html" target="_self">Geschichte</a>
<a class="menuItem" href="firmenportrait.html" target="_self">Firmenportrait</a>
<a class="menuItem" href="service.html" target="_self">Service &amp; Support</a>
<a class="menuItem" href="referenzen.html" target="_self">Referenzen</a>
<a class="menuItem" href="karriere.html" target="_self">Karriere</a>
<a class="menuItem" href="presse.html" target="_self">Presse</a>
<a class="menuItem" href="partnerlinks.html" target="_self">Partner-Links</a></div>

<div id="menu3" class="menu">
<a class="menuItem" href="abfalluabwasserindustrie.html" target="_self">Abfall- u. Abwasser-Industrie</a>
<a class="menuItem" href="chemischeindustrie.html" target="_self">Chemische Industrie</a>
<a class="menuItem" href="lebensmittelindustrie.html" target="_self">Lebensmittel-Industrie</a>
<a class="menuItem" href="wasserversorgungsindustrie.html" target="_self">Wasserversorgungs-Industrie</a>
<a class="menuItem" href="bergbauindustrie.html" target="_self">Bergbau-Industrie</a>
<a class="menuItem" href="holzbauindustrie.html" target="_self">Holzbau-Industrie</a>
<a class="menuItem" href="maschinenundanlagenbau.html" target="_self">Maschinen- u. Anlagenbau</a>
<a class="menuItem" href="elektrothermografie.html" target="_self">Elektro-Thermografie</a></div>

<div id="menu4" class="menu">
<a class="menuItem" href="frequenzumrichter.html" target="_self">Frequenzumrichter</a>
<a class="menuItem" href="hardundsoftware.html" target="_self">Hard- &amp; Software</a>
</div>

<div id="menu6" class="menu">
<a class="menuItem" href="anfrage.html">Anfrage</a>
<a class="menuItem" href="ansprechpersonen.html" target="_self">Ansprechpersonen</a>
<a class="menuItem" href="anfahrt.html" target="_self">Anfahrt</a></div>