AIDE MISE EN PAGE CODE SOURCE IE / FIREFOX

C'est bon j'ai changer mon css , mais je n'ai noté aucun chagement

******OUILLE********

<!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">
<head>
<script></script>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252" />

<meta content="MSHTML 5.50.4522.1800" name="GENERATOR" />
<title>LIVIA</title>

<link href="004.ico" rel="SHORTCUT ICON" />

<meta name="keywords" content="" />

<meta name="description" content="" />

<link href="default.css" rel="stylesheet" type="text/css" media="screen" />

<meta content="MSHTML 5.00.3105.105" name="GENERATOR" />

<link href="style.css" rel="stylesheet" type="text/css" />

<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />

---------------------------------------------

deja ton fichier "default.css" n' existe pas.

ensuite, ca sera mieux avec ton css de "style.css" que voici:

html, body {
margin : 0;
padding : 0;
}
body {
font : 73% Arial, Helvetica, "Trebuchet MS", Arial, Tahoma, sans-serif;
background : #D5DBE1;
color : #555;
}
/*WRAP*/
#wrap {
width: 100%;
margin-left: auto;
margin-right: auto;
padding: 0;
}
/*BANNER*/
#masthead {
height:200px;
padding: 0;
margin-bottom: 0;
background: #B5B5B5 url(images/masthead.jpg) top center no-repeat;
}
/*MAIN CONTAINER*/
#container {
width: 770px;
border: 0px solid #aaa;
margin-left: auto;
margin-right: auto;
padding: 0;
line-height: 1.8em;
}
/*TOP NAVIGATION*/
#menu {
height: 50px;
padding: 0;
margin-bottom: 0;
background-color: #D5DBE1;
}
#menu{position:relative;display:block;height:21px;font-size:1em;
font-weight:bold;background:transparent url(images/bgOFF.gif) repeat-x top left;
font-family:Arial,Verdana,Helvitica,sans-serif;}
#menu ul{margin:0;padding:0;list-style-type:none;width:auto;}
#menu ul li{display:block;float:left;margin: 0 1px 0 0;}
#menu ul li a{display:block;float:left;color:#333;text-decoration:none;
padding:4px 20px 0 20px;height:18px;}
#menu ul li a:hover,#menu ul li a.current{color:#000;
background:transparent url(images/bgON.gif) repeat-x top left;}
/*MAIN CONTENT*/
#content {
padding: 1em;
margin: 0 320px 0 0;
background: #D5DBE1;
}
/*SIDEBAR*/
#sidebar {
float: right;
width: 280px;
margin: 15px 0 0 0;
padding: 0 1em 0 1em;
background:#EBEBEB;
}
/*SIDE NAV*/
#navcontainer {
width : 280px;
margin : 0 0 20px 0;
}
#navcontainer ul {
margin-left : 0;
padding-left : 0;
list-style-type : none;
}
#navcontainer a {text-decoration : none;
display : block;
padding : 3px;
width : 280px;
border-bottom : 1px solid #eee;
background : #D5DBE1;
color : #666;
}
#navcontainer a:link, #navlist a:visited {
color : #666;
background : #D5DBE1;
}
#navcontainer a:hover {text-decoration : none;
background : #C9D2DF;
color : #fff;
}
/*FOOTER*/
#footer {
clear: both;
height: 100px;
padding: 0;
margin-top: 20px;
text-align: center;
color: #333;
background: #B5B5B5 url(images/footer.jpg) top center no-repeat;
}
/*TYPOGRAPHY*/ h1 {
margin: 0;
padding: 20px 0 20px 5px;
font-size: 160%;
letter-spacing: 3px;
color: #333;
}
blockquote {
font-weight : bold;
font-style : italic;
color : #b29b35;
}
/*IMAGES*/
.right {
float: right;
border: 0px solid #656C4A;
margin: 5px 0 10px 0;
padding: 10px;
}
/*LINKS*/
a:link, a:visited {
color : #DD618A;
background : inherit;
text-decoration : underline;
}
a:hover {
color : #666;
background : inherit;
text-decoration : none;
}
a img {
border: 0;
}

#alignement{
margin-left: auto;
margin-right: auto;
text-align: center;
}

Voila, la on va pouvoir t' aider :)