Hello,

I keep geting this error can you help me please.

Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at /home/markhost/public_html/index.php:3) in /home/markhost/public_html/styles/top.php on line 2

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/markhost/public_html/index.php:3) in /home/markhost/public_html/styles/top.php on line 2


This is top.php code below.

Code:
<?php
session_start();
$username = $_SESSION['username'];
$userid = $_SESSION['userid'];
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title><?php echo $title; ?></title>
<link href="styles/main.css" rel="stylesheet" type="text/css"></link>
<script language="javascript" src="scripts/javascript.js"></script>
</head>
<body>

<div id='wrapper'>

<div id='header'>
	<div id='status'><?php require('scripts/status.php'); ?></div>
	<a href='http://www.markhost.biz/'><img src='images/banner.png'></img></a>
</div>

<div id='nav'>
<ul>
<li>
<a href="http://www.markhost.biz/">Home</a>
</li>
<li>
<a href="#">Free Download</a>
</li>
<li>
<a href="#">Buy Full Version</a>
</li>
<li>
<a href="#">F.A.Q</a>
</li>
<li>
<a href="#">Forums</a>
</li>
<li>
<a href="#">Support</a>
</li>
</ul>	
</div>

<div id='content'>