<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<style type="text/css">
html, body {height:100%;}
body {margin:0;padding:0;}
#main_block,
#left,
#right,
#center {
height:auto !important;
height:100%;
min-height:100%;
}
#main_block {position:relative;width:100%;}
#center {display:block;margin:0 100px 0 250px;background-color:red;}
#left, #right {position:fixed;_position:absolute;top:0;}
#left {width:250px;left:0;background-color:blue;}
#right {width:100px;right:0;background-color:green;}
</style>
</head>
<body>
<div id="main_block">
<div id="left"></div>
<div id="right"></div>
<div id="center"></div>
</div>
</body>
</html>