PHP header command

asiddle423

can anyone help i keep getting this error message and i cant see why

Warning: Cannot modify header information - headers already sent by (output started at /home/asiddle4/public_html/header.inc:59) in /home/asiddle4/public_html/login.php on line 23

my header file is below starting from line 51

<html>
<head>
<link rel="stylesheet" href="style.css" type="text/css" />
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>CMS Tutorial</title>
</head>

<body>
<table align="center" style="border: 1px solid #000000;" width="770" height="100%" bgcolor="#275F81" border="0" cellspacing="10" cellpadding="0">
<tr>
<td>
<table align="center" width="750" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><img src="banner.jpg" width="750" height="150" /></td>
</tr>
</table>
<table align="center" width="750" style="border-left: 1px solid #000000;border-right: 1px solid #000000" border="0" cellspacing="0" cellpadding="0">
<tr>
<td height="25" align="left" width="174" background="header.jpg" style="border-right:1px solid #000000;border-bottom:1px solid #000000;"> Navigation </td>
<td height="25" align="center" width="400" background="header.jpg" style="border-right:1px solid #000000;border-bottom:1px solid #000000;">News</td>
<td height="25" align="left" width="174" background="header.jpg" style="border-bottom:1px solid #000000;"> Other </td>
</tr>
</table>

and the login file is below starting from line 20

$query = mysql_query("SELECT username,password FROM users WHERE username = '$username'") or die(mysql_error());
$row = mysql_fetch_array($query);
$_SESSION["s_username"] = $row['username'];
header("Location: layout.php");

thanks asiddle423

Simulator

the header has to go before the HTML tag...

clip

true. it has to have a form with a post method.