Firefox/IE7 customising template issue

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<link rel="stylesheet" media="all" type="text/css" href="assets/templates/bfound_horizontal/bfound.css" />
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
<title>[(site_name)] | [*pagetitle*]</title>
</head>
<body>

<!-- start wrap -->
<div id="wrap">

<!-- start header -->
<div id="header"></div> 
<!-- end header -->

<!-- start front image -->
<div id="frontphoto">
<img id="frontphoto" src="assets/templates/bfound_horizontal/images/front.jpg"  width="760" alt=""/>
<!-- end front image -->
</div>

<!-- start navigation -->
<div id="nav">
[[Wayfinder? &startId=`0` &level=`4` &parentClass=`hide` &parentRowTpl=`cssplay_parentRow` &outerTpl=`cssplay_outer` &innerTpl=`cssplay_inner` &rowTpl=`cssplay_row` &outerClass=`menu` &cssTpl=`cssplay_basicdd`]]
</div>
<!-- end navigation -->

<!-- start left sidebar -->
<div id="left_sidebar">Left sidebar</div>
<!-- end left sidebar -->

<!-- right sidebar -->
 <div id="right_sidebar">Right  sidebar </div>
<!-- end right sidebar-->

<!-- start content -->
<div id="content">[*content*]</div> 
<!-- end content -->

<!-- start footer -->
<div id="footer"><p>© 2008 <a href="mailto:[(emailsender)]">[(site_name)]</a> - Website af <a href="http://www.bfound.dk/">Bfound</a></p> </div> 
<!-- end footer -->

</div>
<!-- end wrap -->
</body>
</html>

/* CSS Document */
Screen layout: */

body{
margin:0 auto;
padding:0;
font:76% Verdana,Tahoma,Arial,sans-serif;
background:#f4f4f4 url(images/bg.gif) top center repeat-y;
color:#303030;
}


/*TEST*/
#nav{
background: url(images/nav.jpg) repeat-x; 
}

#wrap{
background:#ffffff;
color:#303030;
margin:0 auto;
width:760px;
}

#header{
clear:both;
margin:0 0 0 0;
padding:0;
height:8px;
}
#header h1{
width:250px;
margin:5px 20px 0;
float:left;
}
#header p{
width:500px;
float:right;
text-align:center;
color:#a0a0a0;
margin:0 0 10px 0;
font-size:0.8em;
line-height:1.2em;
background-color:inherit;
}

#frontphoto{
margin:0 0 0 0;
border:0;
}

#left_sidebar{
clear:left;
float:left;
width:120px;
margin:20px 0 10px 0;
padding:0;
font-size:0.9em;
line-height:1.5em;
}

#right_sidebar{
clear:right;
float:right;
width:120px;
margin:20px 0 10px 0;
padding:0;
font-size:0.9em;
line-height:1.5em;
}
#right_sidebar p{
margin:0 0 1.5em 0;
}

#content{
margin:30px 130px 20px 160px;
border-left:1px solid #f0f0f0;
border-right:1px solid #f0f0f0;
padding:0 10px 0 10px;
line-height:1.6em;
text-align:left;
}
#content h2{
font-size:1.5em;
margin:0 0 0.5em 0;
}
#content img{
padding:1px;
display:inline;
background:#cccccc;
color:#303030;
border:4px solid #f0f0f0;
}

h3{
font-size:1.3em;
margin:0 0 10px 0;
}

a{
text-decoration:none;
color:#286ea0;
}
a:hover{
text-decoration:underline;
color:#286ea0;
}
a img{
border:0;
}

#footer{
clear:both;
margin:0 auto;
padding:10px 0 20px 0;
border-top:4px solid #f0f0f0;
width:760px;
text-align:center;
color:#808080;
font-size:0.9em;
}
#footer a{
color:#808080;
text-decoration:none;
}
#footer a:hover{
text-decoration:underline;
}





.announce{
margin:10px 0 10px 0;
padding:10px;
width:530px;
color:#505050;
background-color:#f4f4f4;
line-height:1.3em;
}

.left{
margin:10px 10px 5px 0;
float:left;
}

.right{
margin:10px 0 5px 10px;
float:right;
}

.textright{
text-align:right;
}

.center{
text-align:center;
}

.small{
font-size:0.8em;
}

.bold{
font-weight:bold;
}

.hide{
display:none;
}

/* CSS Document */

/* common styling */

/* set up the overall width of the menu div, the font and the margins */


.menu {
font-family: arial, sans-serif; 
background: url(images/nav.jpg) repeat-x; 
border:0px solid #fff;
width:760px; 
margin:0; 
margin:0 0 0 0;
position:relative;
z-index:100;
}

/* remove the bullets and set the margin and padding to zero for the unordered list */
.menu ul {
padding:0; 
margin:0;
list-style-type: none;
background: url(images/nav.jpg) repeat-x; 
}

/* float the list so that the items are in a line and their position relative so that the drop down list will appear in the right place underneath each list item */
.menu ul li {
float:left; 
position:relative;
}

/* style the links to be 104px wide by 30px high with a top and right border 1px solid white. Set the background color and the font size. */

.menu ul li a, .menu ul li a:visited {
display:block; 
background: url(images/nav.jpg) repeat-x; 
text-align:center; 
text-decoration:none; 
width:106px; 
height:30px; 
color:#000; 
border:10px solid #fff;
border-width:0 1px 0 0; /* her ændres border rundt om menukasserne*/
line-height:30px; 
font-size:11px;
}

/* make the dropdown ul invisible */
.menu ul li ul {
display: none;
}

/* specific to non IE browsers */

/* set the background and foreground color of the main menu li on hover */
.menu ul li:hover a {
color:#fff; 
background: url(images/nav.jpg) repeat-x;	
}

/* make the sub menu ul visible and position it beneath the main menu list item */
.menu ul li:hover ul {
display:block; 
background: url(images/nav-hover.jpg) repeat-x; 
position:absolute; 
/*top:31px; */
left:0; 
width:105px;
}

/* style the background and foreground color of the submenu links */
.menu ul li:hover ul li a {
display:block; 
background: url(images/nav-hover.jpg) repeat-x;	
color:#000;
}

/* style the background and forground colors of the links on hover */
.menu ul li:hover ul li a:hover {
background: url(images/nav-current.jpg) repeat-x;	
color:#FFF;
}

.menu {
font-family: arial, sans-serif; 
background: url(images/nav.jpg) repeat-x; 
border:0px solid #fff;
width:760px; 
margin:0; 
margin:0 0 0 0;
position:relative;
z-index:100;
display:table; /* this should help */
}

#nav{
background: url(images/nav.jpg) repeat-x;
display:table; 
}