Certo, riporto il codice HTML e CSS, grazie 1000 
Codice PHP:
CTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title></title>
<link rel="stylesheet" href="css/style.css" type="text/css" />
<script language="javascript">AC_FL_RunContent = 0;</script>
<script src="AC_RunActiveContent.js" language="javascript"></script>
</head>
<body>
<div id="masterContainer">
<div id="header">
<div class="headerLeft">
<div class="blueBarMenu"></div>
</div>
<div class="headerRight">
<div id="menu">
<a class="lnkMenu" href="#">
Home
</a>
<div class="arrowMenu">
[img]images/arrow.gif[/img]
</div>
<a class="lnkMenu" href="#">
Chi Siamo
</a>
<div class="arrowMenu">
[img]images/arrow.gif[/img]
</div>
<a class="lnkMenu" href="#">
Galleria Foto
</a>
<div class="arrowMenu">
[img]images/arrow.gif[/img]
</div>
<a class="lnkMenu" href="#">
Offerte
</a>
<div class="arrowMenu">
[img]images/arrow.gif[/img]
</div>
<a class="lnkMenu" href="#">
Marchi
</a>
<div class="arrowMenu">
[img]images/arrow.gif[/img]
</div>
<a class="lnkMenu" href="#">
Contatti
</a>
</div>
</div>
</div>
<div class="breakBar"></div>
<div id="spot">
<div class="slide">
<script language="javascript">
if (AC_FL_RunContent == 0) {
alert("Questa pagina richiede AC_RunActiveContent.js.");
} else {
AC_FL_RunContent(
'codebase', 'http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0',
'width', '578',
'height', '256',
'src', 'swf/slide',
'quality', 'high',
'pluginspage', 'http://www.macromedia.com/go/getflashplayer',
'align', 'middle',
'play', 'true',
'loop', 'true',
'scale', 'showall',
'wmode', 'window',
'devicefont', 'false',
'id', 'swf/slide',
'bgcolor', '#cccccc',
'name', 'swf/slide',
'menu', 'true',
'allowFullScreen', 'false',
'allowScriptAccess','sameDomain',
'movie', 'swf/slide',
'salign', ''
); //end AC code
}
</script>
<noscript>
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="578" height="256" id="swf/slide" align="middle">
<param name="allowScriptAccess" value="sameDomain" />
<param name="allowFullScreen" value="false" />
<param name="movie" value="swf/slide.swf" /><param name="quality" value="high" /><param name="bgcolor" value="#cccccc" /> <embed src="swf/slide.swf" quality="high" bgcolor="#cccccc" width="578" height="256" name="swf/slide" align="middle" allowScriptAccess="sameDomain" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" />
</object>
</noscript>
</div>
</div>
<div id="container">
<div class="containerLeft">
<div class="contLeft01">
<div class="contLeft01Left">
Lorem conseter lorem conseter dolor sit amet, sed diam elitr, sed diam Lorem ipsum dolor sit
</div>
<div class="contLeft01Right">
[img]images/vasca01.jpg[/img]
</div>
</div>
[img]images/vetrina1.jpg[/img]
</div>
<div class="containerRight">
<div class="contRightTitle">
Servizi
</div>
<div class="contRight01">
<div class="contRight01Left">
[img]images/servizi1.jpg[/img]
</div>
<div class="contRight01Right">
Lorem conseter lorem conseter dolor sit amet, sed diam elitr, sed diam Lorem ipsum dolor sit Lorem conseter lorem conseter do
</div>
</div>
<div class="breakBar"></div>
<div class="contRightTitle">
Prodotti
</div>
<div class="contRight01">
<div class="contRight01Left">
[img]images/prodotti1.jpg[/img]
</div>
<div class="contRight01Right">
Lorem conseter lorem conseter dolor sit amet, sed diam elitr, sed diam Lorem ipsum dolor sit Lorem conseter lorem conseter do
</div>
</div>
</div>
</div>
<div class="breakBar"></div>
<div id="footer">
© 2010 - tutti i diritti riservati
</div>
</div>
</body>
</html>
Codice PHP:
body {
background: url(../images/bg01.gif) repeat-x top;
margin: 0;
}
#masterContainer{
width: 978px;
margin: 0 auto;
}
#header{
height: 63px;
}
.headerLeft{
float: left;
width: 400px;
padding-top: 21px;
}
.headerRight{
width: 563px;
float:right;
text-align: left;
}
.blueBarMenu{
background: #3366cc;
height: 30px;
}
#menu{
padding-top: 5px;
}
.breakBar{
background: #cccccc;
width: 100%;
height: 3px;
margin: 5px 0;
display: block;
clear: both;
}
.lnkMenu{
font-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
text-transform: uppercase;
float: left;
line-height: 60px;
color: #3366cc;
font-size: 12px;
text-decoration: none;
}
.lnkMenu:hover{
color: #ff6600;
}
.lnkMenu:hover{
background: url(../images/hoveritem.jpg) top center no-repeat;
background-position-y: 8px;
}
.arrow{
margin: 29px 14px 0;
float: left;
}
#spot{
width: 978px;
height: 256px;
background: url(../images/spot.jpg);
}
.slide{
float: right;
}
#container{
font-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
color: #666666;
text-align: justify;
font-size: 10px;
margin-top: 15px;
display: block;
clear: both;
}
.containerLeft{
float: left;
width: 400px;
}
.containerLeft01{
}
.contLeft01Left{
width: 220px;
float: left;
}
.contLeft01Right{
float: right;
}
.containerRight{
float: right;
width: 563px;
}
.contRightTitle{
width: 568px;;
font-size: 16px;
color: #666666;
text-transform: uppercase;
display: block;
clear: both;
margin-bottom: 10px;
}
.contRight01{
height: 107px;
}
.contRight01Left{
float: left;
}
.contRight01Right{
width: 380px;
text-align: justify;;
float: right;
}
.evident{
font-weight: bold;
color: #216e84;
}
.img1{
margin-top: 10px;
}
#footer{
font-family: Verdana, Geneva, Arial, Helvetica, sans-serif;
color: #999999;
font-size: 12px;
text-align: center;
}
Il problema è che il breakBar in basso mi andava a sovrapporsi al container come se l'altezza del container non esistesse.
Il problema di sovrapposizione l'ho risolto inserendo in .breakBar: display:block; clear: both;
Così in questo modo non si sovrappone più, ma se al breakBar vado a dare un margin-top il margine mi parte dalla parte alta del container.
In sostanza, se il container, in base al contenuto, è diventato alto 500, ad esempio, per dare al breakBar un margine di 15 dovrò scrivere margin-top: 515px;
Non so, è come se fosse annullata l'altezza e il contenuto non "riempia" il div. bho!