dieselross: Anfängerfehler? Navi in floatender UL reagiert nur teilweise

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Hmmm. Und dann wieder doch nicht.
Zu Hause nachgetestet und jetzt klappt alles bis auf...
tja bis auf die Tatsache, daß mein Hauptcontent
(<div id="content">)
jetzt in Safari und Firefox linksbündig steht.
Er sollte aber zentriert sein. Was mach' ich falsch?

HTML:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
  "http://www.w3.org/TR/html4/strict.dtd">

<html>

<head>
  <meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
  <title>Rollover per CSS</title>
  <link href="CSS/Rollovers_per_CSS.css" rel="stylesheet" type="text/css" media="all">
  <style type="text/css" media="screen"></style>
 </head>

<body>
  <div id="content">
   <div id="header">
   </div>
   <div id="menu">
    <a class="menu" id="home" href="index.htm"></a>
    <a class="menu" id="news" href="extras/index.htm"></a>
    <a class="menu" id="pics" href="links/index.htm"></a>
    <a class="menu" id="contact" href="mailto:name@domain.de"></a>
   </div>
   <img src="images/MainFondBottom.jpg" id= "footer">
  </div>
 </body>

</html>

CSS:

body  { color: #464646; font-size: 62.5%; font-family: Verdana, Arial, Helvetica, sans-serif; background-image: url("../images/WebBG.jpg"); text-align: center; margin: 0; padding: 0 }

h1 {font-size: 1.4em; font-weight: bold}
#content   { background-image: url("../images/MainFondMain.jpg"); background-repeat: repeat-y; background-attachment: scroll; background-position: 0 0; text-align: left; position: relative; z-index: 0; width: 740px; min-height: 300px; voice-family: inherit     }
#header { display: block; background-image: url("../images/MainFondTop.jpg"); background-repeat: no-repeat; text-align: left; margin-left: -1px; top: -2em; left: -2em; width: 740px; height: 40px }
#menu   { text-decoration: none; background-image: none; list-style-type: none; display: block; position: relative; z-index: 1; right: 41px; width: 110px; float: right }
#mainText   { line-height: 1.6em; padding-right: 10em; padding-left: 3em; position: relative }
#footer { display: block; background-image: url("../images/MainFondBottom.jpg"); background-repeat: no-repeat; margin-bottom: -10px; margin-left: -1px }

#HomeCurrent { background-image: url("../images/SideButtonHomeDown.jpg"); background-repeat: no-repeat; display: block; width: 110px; height: 40px }
#home:link    { display: block; background-image: url("../images/SideButtonHomeUp.jpg"); width: 110px; height: 40px; background-repeat: no-repeat}
#home:visited { display: block; background-image: url("../images/SideButtonHomeUp.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }
#home:hover   { display: block; background-image: url("../images/SideButtonHomeOver.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }
#home:active  { display: block; background-image: url("../images/SideButtonHomeDown.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }

#PicsCurrent { background-image: url("../images/SideButtonPicsDown.jpg"); background-repeat: no-repeat; display: block; width: 110px; height: 40px }
#pics:link     { display: block; background-image: url("../images/SideButtonPicsUp.jpg"); background-repeat: no-repeat; width: 110px; height: 40px }
#pics:visited  { display: block; background-image: url("../images/SideButtonPicsUp.jpg"); background-repeat: no-repeat; width: 110px; height: 40px }
#pics:hover   { display: block; background-image: url("../images/SideButtonPicsOver.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }
#pics:active  { display: block; background-image: url("../images/SideButtonPicsDown.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }

#NewsCurrent { background-image: url("../images/SideButtonNewsDown.jpg"); background-repeat: no-repeat; display: block; width: 110px; height: 40px }
#news:link     { display: block; background-image: url("../images/SideButtonNewsUp.jpg"); background-repeat: no-repeat; width: 110px; height: 40px }
#news:visited { display: block; background-image: url("../images/SideButtonNewsUp.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }
#news:hover   { display: block; background-image: url("../images/SideButtonNewsOver.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }
#news:active  { display: block; background-image: url("../images/SideButtonNewsDown.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }

#ContactCurrent { background-image: url("../images/SideButtonContactDown.jpg"); background-repeat: no-repeat; display: block; width: 110px; height: 40px }
#contact:link    { display: block; background-image: url("../images/SideButtonContactUp.jpg"); width: 110px; height: 40px; background-repeat: no-repeat}
#contact:visited { display: block; background-image: url("../images/SideButtonContactUp.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }
#contact:hover   { display: block; background-image: url("../images/SideButtonContactOver.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }
#contact:active  { display: block; background-image: url("../images/SideButtonContactDown.jpg"); width: 110px; height: 40px;  background-repeat: no-repeat }