Problem med div udvidelse i FF

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#####KODE:
---------------
<div align="center">
    <div id="top">
        ///Banner her!!
    </div>
    <div id="topmenu">
        <a href="?page=home" class="topmenu" title="Forside">Forside</a>   
    </div>
<div id="main">
  <div style="float:right;position:relative;">   
    <div class="top_right">
      Login:
    </div>
    <div class="box_right">
      //LoginForm
        <div style="text-align:center;"><a href="?page=help">Problem ?</a></div>
    </div>

    <br />

    <div class="top_right">
      Statistik:
    </div>
    <div class="box_right">
      //Besøgs statistik
    </div>

  </div>
INDHOLD
</div>
    <div id="footer">
        Coprytigt Notice
    </div>
</div>
-----------

#####STYLESHEET:
--------------
body{
  background-color:#E8E7E2;
  color:#000;
  font-family:verdana, tahoma;
  font-size:10px;
}
#top{
  color:#000;
  background-color:#4C8449;
  border:1px solid #6c6c6c;
  width:700px;
  text-align:left;
}
#topmenu{
  color:#000;
  background-color:#e1e1e1;
  border-left:1px solid #6c6c6c;
  border-right:1px solid #6c6c6c;
  border-bottom:1px solid #6c6c6c;
  width:700px;
  height:22px;
}
#main{
  color:#000;
  position:relative;
  padding:2px;
  background-color:#efefef;
  border-left:1px solid #6c6c6c;
  border-right:1px solid #6c6c6c;
  width:696px;
  height:auto;
  text-align:left;
}
#footer{
  clear:both;
  position:relative;
  color:#ffffff;
  background-color:#4C8449;
  border:1px solid #6c6c6c;
  width:700px;
  text-align:center;
}

div.top_right{
  position:relative;
  padding:2px;
  text-align:left;
  width:180px;
  border:1px solid #6C6F6C;
  background-image:url('images/bjaelke_bg.gif');
  background-color:#4C8449;
  color:#ffffff;
  font-size:13px;
  font-weight:bold;
}
div.box_right{
  position:relative;
  color:#000;
  padding:2px;
  text-align:left;
  width:180px;
  border-left:1px solid #6C6F6C;
  border-right:1px solid #6C6F6C;
  border-bottom:1px solid #6C6F6C;
  background-color:#e1e1e1;
}
-----------------------------

Jeg har kun taget det relevante ud fra mit stylesheet, hvis i mangler noget mere af det, så sig til :-)

Nogen der kan hjælpe??

Så lukker jeg :-)