Вот, что получилось у меня:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title>Title</title>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<style type="text/css">
body {
margin: 0px;
}
.column-wrapper {
width: 50%;
margin: 0px auto;
padding: 80px 0px 0px 0px;
}
.column-left-wrapper {
width: 200%;
height: 0px;
margin-left: -100%;
margin-top: -80px;
}
.column-right-wrapper {
height: 0px;
width: 100%;
margin-left: 50%;
margin-top: -80px;
}
.column-left{
background: #ffcccc;
text-align: justify;
position: relative;
padding: 10px;
}
.column-right {
background: #ccccff;
text-align: justify;
position: relative;
padding: 10px;
}
.column-middle-wrapper {
width: 50%;
margin: 0px 0px 0px 0px;
}
.column-middle-wrapper-2 {
position: relative;
z-index: 2;
float: left;
width: 100%;
margin-right: 100%;
}
.column-middle {
float: right;
background: #ffffcc;
position: relative;
z-index: 2;
padding: 5px 10px;
width: 200%;
margin-right: -100%;
text-align: justify;
}
</style>
</head>
<body>
<div class="column-wrapper">
<div class="column-middle-wrapper">
<div class="column-middle-wrapper-2">
<div class="column-middle">
MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE MIDDLE
</div>
<div class="column-left-wrapper">
<div class="column-left">
LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT
LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT
LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT LEFT
</div>
</div>
</div>
</div>
<div class="column-right-wrapper">
<div class="column-right">
RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT
RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT
RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT RIGHT
</div>
</div>
</div>
</body>
</html>
IE6, к сожалению, как обычно…