non sò se sono riuscito a spiegarmi col mio italiano maccheronico... questo esempio dovrebbe far capire quel che volevo intendere

codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="charset=windows-1252">
<title></title>
<style type="text/css">
body{margin:auto}

div#container{width:100%;min-width:800px}

div#float1{float:left;width:100px;height:100px;background-color:#ff0000}
div#float2{float:left;width:100px;height:100px;background-color:#ff00ff}
div#content{margin-left:200px;background-color:#ffff00}
</style>
</head>
<body>
<div id="container">
<div id="float1"></div>
<div id="float2"></div>
<div id="content">
test test test test test test test test test test test test test test test test test test 
test test test test test test test test test test test test test test test test test test 
test test test test test test test test test test test test test test test test test test 
test test test test test test test test test test test test test test test 
</div>
</div>
</body>
</html>