this or something like it should be what you are looking for
code:
//CSS
#frame {
width: 800px;
margin: auto;
float: left
}
//HTML
<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" id="general">
<div id="frame">
<div id="header">
<h1>Centre international de résolution de conflits et de médiation (C.I.R.C.M.)</h1>
...
<li> La médiation sociale : Ce département offre aux individus, aux organismes et à la
communauté des alternatives pour prévenir ou résoudre les conflits</li>
</ul>
</p>
</div>
</div>
</body>
just make a div to hold everything in 800px wide and nest the remainder inside of it
I do a variation of this at my site (www.ixifx.net), feel free to view the source. the css is at www.ixifx.net/black.css
hope this helps,
You know I'd like to keep my cheeks dry today, so stay with me and I'll have it made (Shannon Hoon)