Solucionado
Código HTML:
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Radio Exta - Musica Radio Online</title>
<style type="text/css">
<!--
body {
background-color: #0F0;
margin-left: 0px;
margin-top: 0px;
margin-right: 0px;
margin-bottom: 0px;
}
#apDiv1 {
position:absolute;
width:33.33%;
z-index:1;
background-color: #F00;
height: 100px;
color: #FFF;
font-size: 36px;
text-align: center;
}
#apDiv2 {
position:absolute;
width:33.33%;
height:100px;
z-index:2;
clip: rect(auto,auto,auto,66.3%);
background-color: #FF0;
float: left;
margin-left: 33.33%;
font-size: 36px;
text-align: center;
color: #FFF;
}
#apDiv3 {
position:absolute;
width:33.33%;
height:100px;
z-index:3;
margin-left: 66.66%;
background-color: #00F;
color: #FFF;
font-size: 36px;
text-align: center;
}
-->
</style></head>
<body>
<div id="apDiv1">1</div>
<div id="apDiv2">2</div>
<div id="apDiv3">3</div>
</body>
</html>