cerco di essere conciso se provate a copiare il codice capite il mio problema:

style:
html, body{margin:0; padding:0;text-align:center;
font-size: 10px;
background:#000000;
color: #333333;
font-family:Arial, sans-serif;
width: 100%;
height: 100%;
margin:0px;padding:0px}

body{text-align:center;
font-size: 10px;
background:#000000;
color: #333333;
font-family: Arial, sans-serif;
width: 100%;
height: 100%;
margin:0px;padding:0px}


.container{width:770px;background:#ffffff;
font-size: 11px;
color: #333333;
font-family: Arial, sans-serif;text-align:left;
margin:auto; padding:auto;
height:100%;
}


.box_contenuto
{
padding:0;margin:0px;
border-left:1px solid #E7DFDA;
border-right:1px solid #E7DFDA;
border-top:1px solid #E7DFDA;
border-bottom:1px solid #E7DFDA;
}

.contenuto{
}

h1{font-size:40px;}

.footer{clear:left; width:auto;}

.box_logo{float:left; height:130px;padding:0;max-height:130px;margin:0;
}
.logo{padding-top:10;padding-left:5px;}

.box_pulsanti{float:left; width:495;height:130px;padding:0;max-height:130px;margin:0;padding:0;
}

.sapzio_pulsanti_primo{float:left;padding-top:0;padding-left:23;padding-right:5;
}

.sapzio_pulsanti{float:left;padding-top:0;padding-left:5;padding-right:5;
}

.sapzio_pulsanti_ultimo{float:left;padding-top:0;padding-left:5;padding-right:2;
}
.pulsante{float:left;}

.clear{clear:both;}

.nero{background:#5B574D;height:3px;}

.box_contenuto_testo{float:right;width:518px;margi n-right:0px;
background:#cccccc;}

.contenuto_testo{margin-right:250px;}

.box_menu_2{float: left;width: 250px;margin:0pxadding:0;
background:#cccccc;}

.menu_2{
margin-top:10px;
margin-left:3px;margin-right:5;
padding-left:3px;padding-right:5;
border-left:1px solid #8A8373;
border-right:1px solid #8A8373;
}


pagina:
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Nuova pagina 1</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head>

<body>
<div class="container">
<div class="box_contenuto">
<div class="contenuto">
<div class="box_logo">
<div class="logo">
[img]img/logo.gif[/img]
</div>
</div>
<div class="box_pulsanti">
<div class="sapzio_pulsanti_primo">
<div class="pulsante">
[img]img/pulsanti/home.jpg[/img]</div></div>
<div class="sapzio_pulsanti">
<div class="pulsante">[img]img/pulsanti/azienda.jpg[/img]</div></div>
<div class="sapzio_pulsanti">
<div class="pulsante">[img]img/pulsanti/auto.jpg[/img]</div></div>
<div class="sapzio_pulsanti_ultimo">
<div class="pulsante">[img]img/pulsanti/prenota.jpg[/img]</div></div>
</div>
<div class="clear">[img]img/1pixt.gif[/img]</div>
<div class="nero">[img]img/1pixt.gif[/img]</div>
<div class="clear">[img]img/1pixt.gif[/img]</div>
<div class="clear">[img]img/foto_immagine.jpg[/img]</div>
<div class="clear">[img]img/1pixt.gif[/img]</div>
<div class="nero">[img]img/1pixt.gif[/img]</div>

<div class="box_contenuto_testo">
<div class="contenuto_testo">
conten







uto d d d d d d d d d d d d d d d d d d
d d d d d d d d d d d d d d d d d d d d d d d d d d
d d d d d d 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
</div>
</div>

<div class="box_menu_2">
<div class="menu_2">d</div>
</div>

</div>



</div>

</div>


</body>
</html>



domanda se volessi fare l'elemento box_menu_2 alto 100% perchè in ff sfora la pagine ed in ie lo fa troppo lungo

potete spiegarmi come funziona bene

grazie e ciao a tutti