Questo è il mio CSS:
#container_ext{
width:730px;
margin: 0px auto; /*centra negli altri browsers*/
text-align: left; /*ripristina l' allineamento del testo*/
}

#spot{
width:150px;
margin:0px 0px 0px 600px;
padding:0px 0px 0px 10px;
}

#container_1{
width:600px;
float:left;
}
#header{
}
#container_2{
}
#container_3{
background-image:url(imgs/imgs_standard/body.jpg);
padding: 0px 0px 0px 0px;
}
#newsrow{
width:180px;
margin:0px 0px 0px 0px;
padding:3px 0px 0px 18px;
float:left;
}
#content{
width:370px;
margin:0px 0px 0px 212px;
padding:3px 3px 0 3px;
}
#footer{
clear:both;
height:36px;
}

La mia pagina :
....
<body>

<div id="container_ext">

<div id="container_1">

<div id="header">
.....
</div>

<div id="container_2">

<div id="container_3">

<div id="newsrow">
......
</div>

<div id="content">
....
</div>

<div id="footer">
[img]imgs/imgs_standard/fine.jpg[/img]
</div>
</div>
</div>

</div>

<div id="spot">

</div>

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