<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
<title></title>
<style>
div#center{
width:250px;
height:250px;
position:fixed;
top:50%;
left:50%;
margin-top:-125px;
margin-left:-125px;
}
div#left{
width:250px;
height:250px;
position:absolute;
top:-150px;
left:-150px;
background-color:#FF0000;
}
div#center2{
width:250px;
height:250px;
background-color:#0000FF;
position:relative;
}
div#right{
width:250px;
height:250px;
position:absolute;
top:150px;
left:150px;
background-color:#00FF00;
}
</style>
</head>
<body>
<div id="center">
<div id="left">
</div>
<div id="center2">
</div>
<div id="right">
</div>
</div>
</body>
</html>