ciao il problema è ora una parziale incompatibilità con Safari , infatti quando la finestra non è totalmente estesa , appare una barra laterale che , se spostata , fa vedere un margine bianco che sugli altri browser non compare. Il link è www.terranovart.com ,

ecco i nuovi css:

body
{
font-size:14px; color:#000000;
font-family:Arial, Helvetica, sans-serif;
margin: -1px 0px 0px 0px;
}

.container
{
width:950px;
margin:20px auto;
margin-top: 200px;
min-height: 100%;
height: auto !important;
height: 100%;
}

.container1
{
width:100%;
height:200px;
float:left;
z-index: -1;
position:absolute;
}


.header
{
width:100%;
min-width: 950px; /*same as #wrapper**/
min-height: 80px; /**adjust as needed**/
background: #F1E9DC;
padding:30px 0px 80px 0px;
border-style:solid;
border-width:1px;
border-color: gray;
border-left: 0px;
border-right: 0px;
box-shadow: 0px 5px 5px #888888;
float: left;
font: normal 30px Comic Sans MS, cursive;
}


.content
{
min-height: 400px; /**adjust as needed**/
float:left;
width:950px;
text-align:center;
background:#F5EEE7;
text-align: justify;
margin: 1px 5px 0px 0px;
margin-bottom: 20px;
border-style:solid;
border-width:1px;
border-color: gray;
box-shadow: 10px 0 4px -4px #999999 , -10px 0 4px -4px #999999;
}

#footer
{
width:100%;
min-width: 950px; /**same as #wrapper width**/
clear:both;
background-color: white;
height: 30px;
}



#push
{
height: 10px;
clear: both;
}


h2
{
font-weight:bold;
color:#000099;
margin:10px 0px;
}

p span
{
color:#006600;
font-weight:bold;
}

a, a:link, a:visited
{
color:#0000FF;
}


textarea
{
width: 100%;
padding: 10px;
margin: 10px 0 15px 0;
font-size: 13px;
font-family: Consolas,monospace;
}


textarea.html
{
height: 300px;
}


p
{
margin: 0 0 10px 0;
}


code, pre
{
font-family: Consolas,monospace;
color: green;
}


ol li
{
margin: 0 0 15px 0;
}


.alignleft
{
float: left;
padding: 0px 10px 0px 10px;
}


.alignright
{
float: right;
margin: 0px 10px 0px 10px;
border-style:solid;
border-width:2px;
border-color: #EEE3CA;
}


.firsttext
{
text-align:right;
color: black;
font-weight: normal;
margin-top: 0px;
margin-right: 190px;
margin-bottom: 0px;
margin-left: 0px;
font-family: "Comic Sans MS", cursive;
font-size: 14px;
font-style: normal;
font-variant: normal;
}



#secondtext
{
float: left;
margin: 0% 0% 0% 16%;
font: normal 30px Comic Sans MS, cursive;
}

h1
{
padding: 0px 10px 8px 8px;
font-family: Courier New;
font-size: 12px;
}


.lasttext
{
margin-top: 0px;
margin-bottom: 0px;
margin: 0% 0% 0% 16%;
text-align:left;
color: black;
font-weight: normal;
}

#cssmenu ul {margin: 0; padding: 7px 6px 0; background: #F1E8DC url(menu_assets/images/overlay.png) repeat-x 0 -110px; line-height: 100%; border-radius: 1em; font: normal 10 Arial, Helvetica, sans-serif; -webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; -webkit-box-shadow: 0 1px 3px rgba(0,0,0, .4); -moz-box-shadow: 0 1px 3px rgba(0,0,0, .4);}
#cssmenu li {margin: 0 5px; padding: 0 0 8px; float: left; position: relative; list-style: none; }
#cssmenu a,
#cssmenu a:link {color: black; text-decoration: none; display: block; padding: 8px 20px; margin: 0; border-radius: 5px; -webkit-border-radius: 5px; -moz-border-radius: 5px; text-shadow: 0 1px 1px rgba(0,0,0, .3); }
#cssmenu a:hover {background: #000; color: #fff;}
#cssmenu .active a,
#cssmenu li:hover > a {background: #E4CAA3 url(menu_assets/images/overlay.png) repeat-x 0 -40px; color: #444; border-top: solid 1px #f8f8f8; -webkit-box-shadow: 0 1px 1px rgba(0,0,0, .2); -moz-box-shadow: 0 1px 1px rgba(0,0,0, .2); box-shadow: 0 1px 1px rgba(0,0,0, .2); text-shadow: 0 1px 0 rgba(255,255,255, 1); }
#cssmenu ul ul li:hover a,
#cssmenu li:hover li a {background: none; border: none; color: #666; -webkit-box-shadow: none; -moz-box-shadow: none;}
#cssmenu ul ul a:hover {background: #8f8f8f url(menu_assets/images/overlay.png) repeat-x 0 -100px !important; color: #fff !important; -webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; text-shadow: 0 1px 1px rgba(0,0,0, .1);}
#cssmenu li:hover > ul {display: block;}
#cssmenu ul ul {display: none; margin: 0; padding: 0; width: 185px; position: absolute; top: 40px; left: 0; background: #ddd url(menu_assets/images/overlay.png) repeat-x 0 0; border: solid 1px #b4b4b4; -webkit-border-radius: 5px; -moz-border-radius: 5px; border-radius: 5px; -webkit-box-shadow: 0 1px 3px rgba(0,0,0, .3); -moz-box-shadow: 0 1px 3px rgba(0,0,0, .3); box-shadow: 0 1px 3px rgba(0,0,0, .3);}
#cssmenu ul ul li {float: none; margin: 0; padding: 3px; }
#cssmenu ul ul a {font-weight: normal; text-shadow: 0 1px 0 #fff; }
#cssmenu ul:after {content: '.'; display: block; clear: both; visibility: hidden; line-height: 0; height: 0;}
* html #cssmenu ul {height: 1%;}


mentre il resto è:


<!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>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<link rel="stylesheet" type="text/css" href="demoStyleSheet.css" />
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="fadeSlideShow.js"></script>
<script type="text/javascript">
jQuery(document).ready(function(){
jQuery('#slideshow').fadeSlideShow();
});
</script> <title>Nuovo sito</title>
<style type="text/css">

@import url(tutto.css);



</style>
</head>
<body>
<div align="right"><span class="firsttext">Italian English</span></div>
<div class="container1">
<div class="header">[img]logo.jpg[/img]</div>
</div>
<div class="container">
<div class="content">
<div id="cssmenu">
<ul>
<li class="active "><span>Home</span>
<li class="has-sub "> <span>Azienda</span>[*]<span>Prodotti</span>[*]<span>News</span>[*]<span>Contatti</span>[*]<span>Dove</span>[/list]
</div>
<div style="clear:both; margin: 0 0 30px 0;">

</div>
<div id="slideshowWrapper">
<ul id="slideshow">[*][img]images/4.jpg[/img]
[*][img]images/3.jpg[/img][*][img]images/2.jpg[/img][*][img]images/1.jpg[/img]
[/list]
<br clear="all" />
</div>
</div>
<div id="push"></div>
</div>
<div align="left" id="footer"><span class="lasttext">Terranova Copyright
P.iva</span></div>
</body>
</html>



grazie in anticipo!