eccomi di nuovo....ho provato ad usare i css ma non so se ho fatto bene e comunque la tabella non è centrata. Dove devo mettere il margin auto 0?
Il codice della mia pagina ora è questo:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Nome Tab.</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<style type="text/css">
body
{
text-align: center;
}
#container
{
width: 970px;
margin-right: auto;
margin-left: auto;
background-image: url(immagini/sfsabbia.gif);
height: 600px;
margin-top: auto;
margin-bottom: auto;
}
#box1
{
width:277px;
height: 450px;
background-repeat: no-repeat;
padding-bottom: 0px;
}
#box2
{
width: 693px;
height: 450px;
background-repeat: no-repeat;
}
#box3
{
width: 970px;
height: 100px;
background-repeat: no-repeat;
}
#box4
{
width: 970px;
background-repeat: no-repeat;
}
.box
{
float: left;
}
</style>
</head>

<body>
<div id="container">
<div id="box1" class="box">
<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="277" height="450" title="animazione">
<param name="movie" value="flash/animhome.swf">
<param name="quality" value="high">
<param name="wmode" value="transparent">
<embed src="flash/animhome.swf" width="277" height="450" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" wmode="transparent"></embed>
</object>
</div>
<div id="box2" class="box">
<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="300" height="200" title="news">
<param name="movie" value="news_verticali.swf">
<param name="quality" value="high">
<param name="wmode" value="transparent">
<embed src="news_verticali.swf" width="300" height="200" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" wmode="transparent"></embed>
</object>
</div>
<div id="box3" class="box">
<object classid="clsid27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=7,0,19,0" width="970" height="100" title="menu">
<param name="movie" value="flash/menuhome.swf">
<param name="quality" value="high">
<param name="wmode" value="transparent">
<embed src="flash/menuhome.swf" width="970" height="100" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" type="application/x-shockwave-flash" wmode="transparent"></embed>
</object>
</div>
<div id="box4" class="box"></div>
<div style="clear: both"></div>
</div>
</body>
</html>


valeria