ma io la pagina la vedo bene con IE6, non è ottimizzato per altri browse anche perchè non so come si fa.
Cmq questo è il css:

codice:
<style type="text/css">
/* HTML E BODY */

html,body{margin: 1em;padding:0}
body{font-family: georgia,sans-serif;font-size:76%;text-align:center;background: url(sfondo.gif)}

/* CONTENITORE */

div#contenitore{width:70em;border-left: 2px solid black;border-right:2px solid black;background-color:#eee;text-align:left}

/* HEADER */

div#header {background-color: black;color:#eee;text-align:center}

/* CARATTERI */

h1{margin:0}
h1{padding-left:10px;font: bold 2.3em/80px georgia,times,serif}
h3{font-size:1.2em;padding-top:10px}

/* CONTENUTI */ 

div#content{background-color:white;margin:0 250px 0 140px;padding:1em 10px;border-width: 0 1px;border-style:solid;border-color:black}

/* CATEGORIE */

div#content div.categorie{margin:10px 450px 0 10px;border-right: 1px solid black;border-left:1px solid black;border-top:1px solid black;border-bottom:1px solid black}

/* MENU' */

div#menu {float:left;width:130px;padding:1em 0 0 10px;text-align:left}
div#menu ul {margin:0 0 20px;padding:0;list-style-type:none}
div#menu ul a {display:block;width:90px;border-bottom:1px solid #fff;color:#000;font-weight:bold;text-decoration:none}
div#menu ul a:hover{background-color:white;color:#f00}
div#menu ul a#activelink{color:#f00;text-decoration:none}

/* EXTRA */

div#extra{float:right;width:260px;padding: 1em 5px}

/* NEWBOX */

div#extra div.newbox {margin-bottom:2em;font-size:90%;border-right: 1px solid black;border-left:1px solid black;border-top:1px solid black;border-bottom:1px solid black;margin-right:30px;margin-left:30px}
div#extra div.newbox h2 {text-align:center;border-bottom:1px solid black;margin-top:0;padding:1px 2px;background-color:#ccc;font-size:1em}


/* FOOTER */

div#footer {clear:both;background-color:black;font:bold;text-align:center;padding:0.5em;color:#eee}

</style>
e la index:

codice:
<html>
<head>
     <link rel="stylesheet" href="style/stylesheet.css" type="text/css">
</head>
<body>
 <div id="contenitore">
  <div id="header">
   <h1>Qui Il Tuo Logo</h1>
  </div>
  <div id="menu">
   <center><h3>Menu' Principale</h3></center>
   <ul>[*]Home[*]Componenti[*]Periferiche[*]Computer[*]Notebook[*]Reti[*]Fotografia[*]Accessori[*]Software[*]Audio&nbspVideo[/list]
  </div>
  <div id="extra">
   <div class="newbox">
    <h2>Login Cliente</h2>
    <form name="login" action="login.asp" method="post" enctype="text/plain">
    <center><label>Username:&nbsp<input type="text" name="username" size=8 ></label>
    <label>Password:&nbsp <input type="password" name="pass" size=8 ></label></center>
   

   <center><input type="submit" value="Login"></center></form>
   </div>
  </div>
  <div id="content">
   <center>[img]Immagini\benvenuto.JPG[/img]</center>


   <fieldset>
    <legend>[img]Immagini\cat.gif[/img]</legend>
     <div class="categorie">
      [img]Immagini\Categorie\Componenti.jpg[/img]gfdgfdgfdg
     </div>
    <div class="categorie">
      [img]Immagini\Categorie\Componenti.jpg[/img]gfdgfdgfdg
    </div>
   </fieldset>


   <fieldset>
    <legend>[img]Immagini\offerte.gif[/img]</legend>
   </fieldset>
  </div>
  <div id="footer">
   Layout Creato Da ******* ********
Tesina 2004/2005
  </div>
 </div>
</body>
</html>