Ok, faccio prima a postare tutto il codi compreso di css, intanto colgo l'occasione per aggiornarvi dicendo che ho testato con: IE, GoogleCrome, Opera, Safari, Firefox. A malincuore funziona soltanto IE T_T...

Comunque, ecco i sorgenti...
index.php
codice:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">
<html> 
	<head> 
		<title>Titolo</title> 
		<link href="style/style.css" type="text/css" rel="stylesheet"/> 
		<meta http-equiv="Author" content="Francesco Mineo">  
		<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
		<meta http-equiv="Content-Language" content="it">
		<meta content="index, follow" name="robots">
		<meta content="all" name="robots">
		<meta content="Aladin" name="robots">
		<meta content="scooter" name="robots">
		<meta content="Crawler" name="robots">
		<meta content="Eule-Robot" name="robots">
		<meta content="excite" name="robots">
     		<meta content="Flipper/1.1" name="robots">
		<meta content="SmartCrawl" name="robots">
		<meta content="Motor0.5" name="robots">
		<meta content="Mariner" name="robots">
		<meta content="Lycos" name="robots">
		<meta content="7 days" name="revisit-after">	
	</head> 
	<body bgcolor="#135987"> 
		<div id="topbar-container"> 
			<div id="topbar" align="left"> 
				<table align="center" border="0" width="100%" height="145">
					<tr>
						<td height="118">
                					[img]image/logotop.png[/img]
						</td>

<td align="center">
[img]image/topreg.png[/img]
</td>
						<td align="right" valign="top">

							<?
 include "login.php";
		?>
						</td>
					</tr>
					<tr>
						<td colspan="3" align="center" height="27">
							<div align="center" class="menu" id="menu">
								<?
									include 'menu.htm';
								?>
							</div>
						</td>
					</tr>
				</table>
			</div> 
		</div> 
<div align="center">
testo
</div>
	</body> 
</html>
style.css
codice:
body {
font-size: 11px;
font-family: "lucida grande",tahoma,verdana,arial,sans-serif;
color: #333;
line-height: 1.28;
text-align: left;
direction: ltr;

} 
            #topbar-container 
            {        
                left: 0px;       
                margin: 0;       
                width: 100%;       
                z-index: 9999;       
                position: fixed;       
                top: 0px; 
            }    
            #topbar 
            {        
		background: #ffffff url(../image/topbg.png) repeat-x top; margin-top: 5px;     
                border-bottom: 1px solid #ffffff;       
                top: 0px;       
                color: #333;       
                height: 150px;       
                margin:0 auto;       
                width: 100%;       
                z-index: 9999; 
                font-size: 8px;
            }