Ho fatto questo codice. Ho un problema. Alla fine quando chiudo </body> mi da errore. Come mai? Secondo voi il codice che ho realizzato va bene ?

codice:
<!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>

<title>index</title>

<style type="text/css">

body {background:#CCCCCC;background-position: 0% 0%;margin: 15px;font-family:Verdana,Tahoma,Arial; font-size:11px;
background-image: none;background-repeat: repeat;background-attachment: scroll;}

#container {width:1000px; margin:0 auto;}
#header {clear:both; height:100px; margin-bottom:15px; padding:10px; background:#2969A9;}
#corpo {clear:both; padding:10px; margin-bottom:15px; background:#CCCCCC;}
#col_sx {float:left; width:20%; margin-right:15px; border:#CCC 1px solid;}
#col_dx {float:right; clear:right; width:20%; border:#CCC 1px solid;}
#content {float:left; width:55%; background:#CCCCCC;}
#footer {clear:both; height:100px; padding:12px; background:#2969A9;}

div.separatore {clear:both;}

.auto-style1 {text-align: center;}
.auto-style4 {color: #FEFEFF;}
.auto-style5 {color: #FFFFFF;font-style: italic;vertical-align: super;}
.auto-style6 {font-size: 12px;}
.auto-style7 {font-size: 12px;text-decoration: underline;}
.auto-style9 {text-align: center;margin-top: 20px;margin-bottom: 20px;}
.auto-style11 {margin-right: 0px;}
.auto-style12 {vertical-align: top;}
.auto-style13 {text-align: center;background-color: #99ACE8;}
.auto-style14 {background-color: #99ACE8;}
#footer0 {clear:both; height:100px; padding:12px; background:#2969A9;}
.auto-style15 {text-align: center;	background-color: #CCCCCC;}
.auto-style16 {	margin-left: 0px;}

</style>

<link href="barra1.css" rel="stylesheet" type="text/css" />

</head>


<body>
<div id="container">
<div id="header" class="auto-style1" style="width: 960px; height: 111px; border:3px solid white; background:#CCCCCC;">
	[img]logo1.png[/img]</div>
    

<div id="container">
<div id="header" class="auto-style13" style="width: 965px; height: 5px">Sotto Header</div>


<div id="container">
<div id="header" class="auto-style13" style="width: 964px; height: 17px">
	[img]Home2.png[/img]
	[img]hyghf.jpg[/img]
	[img]facebook_32x32.png[/img]
	[img]twitter_32x32.png[/img]
	[img]google_32x32.png[/img]
	[img]youtube_32x32.png[/img]</div>


	<p class="auto-style9" style="width: 980px; height: 6px">
	</p>
    <div id="corpo" style="width: 970px; height: 608px;" class="auto-style11">
    <div id="col_sx" style="width: 22%"><title>default</title>
			 
			 
<div id="menu">			 

	


[img]Sopra%20verde1.png[/img]

<ul class="menu1">
        <li class="auto-style1">Tecniche
        <li class="auto-style1">Chimica
        <li class="auto-style1">Malattie 
        <li class="auto-style1">Pesci
        <li class="auto-style1">Piante
        [/list]







[img]sopra%20arancione1.png[/img]

<ul class="menu2">
       <li class="auto-style1">Tecniche
	   <li class="auto-style1">Chimica
	   <li class="auto-style1">Malattie
	   <li class="auto-style1">Pesci
	   <li class="auto-style1">Invertebrati
	   
	[/list]







[img]sopra%20blu1.png[/img]

<ul class="menu3">
<li class="auto-style1">Tecniche
       <li class="auto-style1">Pesci
       <li class="auto-style1">Allestimento
       <li class="auto-style1">Portfolio
       <li class="auto-style1">Contatti
       [/list]
       </div> 



</div> <div id="content" style="width: 54%; height:513px; border:3px solid white; class="auto-style1/>Contenuti</div>
       <div id="col_dx" style="width: 20%; height: 516px; border:2px solid blue; class="auto-style1 class="auto-style14">Colonna destra</div>
	   <div class="separatore" style="text-align: center; width: 980px; height: 7px;">
		  
		   

		   <div id="footer0" class="auto-style15" style="width: 933px; height: 62px; background:#CCCCCC">
	
	[img]acquariologo.png[/img] 
	[img]consigli.png[/img] 
	[img]zoolandia_acquario.gif[/img] 
	[img]acquarishop_acquario.jpg[/img] 
			   

		  
		  </div>
		  </div>
          </div>
    

<div id="container">
<div id="footer" class="auto-style1" style="width: 965px; height: 16px"><sup><span class="auto-style5"><span class="auto-style7">
© Copyright: 2012 – Webdesign Giacomo Vaglini</span></span></sup><span class="auto-style4"><span class="auto-style6"> </span></span>
[img]valid-xhtml11.png[/img] [img]vcss.png[/img]</div>
[img]network-footer-green.gif[/img]



</div>
</body>
</html>