Nella seguente pagina:

http://www.soccerlandia.net/gianfranco/guestbook

Ho il seguente errore
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/giuamat/public_html/gianfranco/guestbook/index.php:100) in /home/giuamat/public_html/gianfranco/guestbook/index.php on line 116
Ecco il codice della mia pagina:

codice:
<?php
echo'
<!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=iso-8859-1" />
<title>Associazione Gianfranco Troina</title>
<style type="text/css">
<!--
.style2 {
	color: #0000CC;
	font-family: "Comic Sans MS";
}
-->
</style>
</head>
<STYLE TYPE="text/css">
<!-- 
A:link {text-decoration: none; color:#000000}
A:visited {text-decoration: none; color:#000000; size:12; font: Verdana}
A:hover {text-decoration: none; color:#FF0000; size:12; font: Verdana}
-->
</STYLE>
<body background="sfondo.gif">
<center>[img]banner.gif[/img]</center>


<div align="center">
<table width="800" border="0">
  <tr>
    <td>
	<table width="800" border="0">
  <tr>
    <td valign="top" width="165">
	<table width="165" border="0">
  <tr>
    <td>
	<table width="165" border="0">
  <tr>
    <td>
	<table width="165" border="0">
  <tr>
    <td width="30"></td>
    <td width="135"><font face="Comic Sans MS" size="2" color="#0000CC">MENU</font></td>
  </tr>
</table>

	</td>
  </tr>
</table></td>
  </tr>
</table>
<table width="165" border="0">
  <tr>
    <td>
	  <table width="165" border="0">
        <tr>
          <td><div align="left">
		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Chi era Gianfranco</font>

		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Cosa ha lasciato</font>

		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Obiettivi</font>
	
		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Iniziative & Eventi</font>
	  
		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Galleria</font>
		  
		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Statuto</font>
		  
		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Guestbook</font>
		  
		  <font face="Comic Sans MS" size="+2">.</font> <font face="Comic Sans MS" size="2,5" color="#0000CC">Contatti</font>

</div>
		  </td>
        </tr>
      </table>	
<table width="155" border="0">
  <tr>
    <td>
	<table width="155" border="0">
  <tr>
    <td>	<embed width="155" height="50" src="http://www.soccerlandia.net/gianfranco/illbemissingyou.mp3" autostart="true" /></td>
  </tr>
</table>

	</td>
  </tr>
</table>

	  </td>
  </tr>
</table>
	</td>
	
	
	
    <td valign="top" width="605">
	<table width="635" border="0">
  <tr>
    <td><div style="width: 635px; 
height: 400px; 
overflow: auto; 
scrollbar-3dlight-color : #ECD3D3; 
scrollbar-arrow-color : #40120F; 
scrollbar-base-color : #B65858;">
<center>
	
';
//
// VALORI MODIFICABILI
//

// MESSAGGI PER PAGINA
$messaggi_xpag = 20;

// STILE CHE VIENE USATO COME PREDEFINITO
$stile_base = "base.css";


//
// NON MODIFICARE NULLA SOTTO QUESTA RIGA!!
//

session_start();

require_once("config.inc.php");
require_once("function.php");

$output = template("header.tpl");
$output = template("index.tpl", $output);
$output = template("footer.tpl", $output);

$completo = "";

$fp = fopen("messaggi.txt", 'r');
@flock($fp, LOCK_EX);
$content = fread($fp, filesize("messaggi.txt"));

$messaggi = explode("### Nuovo messaggio ###", $content );

@flock($fp, LOCK_UN);
fclose($fp);

$messaggi_tot = count($messaggi) - 1;
$pagine_tot = ceil ( $messaggi_tot / $messaggi_xpag );
$pagina = get_page($pagine_tot);

if ($pagina==1) { $output = hidepart("CAMPO PAGINA", $output); }

$output = preg_replace("#{PAGINA_CORRENTE}#si", $pagina, $output); 

$start = $messaggi_tot - ( ($pagina - 1) * $messaggi_xpag );
$end = ($start - $messaggi_xpag < 1) ? 0 : $start - $messaggi_xpag;

$parti = explode("", $output);
$ciclo = $parti[1];
for ($x=$start; $x > $end; $x=$x-1)
{
 $completo .= $ciclo;
 $parti_messaggio = explode("#p#", trim($messaggi[$x]) );
 $completo = preg_replace("#{NICK}#si", view_nick($parti_messaggio[1]), $completo);
 $completo = preg_replace("#{DATA_ORA}#si", date("d/m/Y G:i", $parti_messaggio[2]), $completo);
 $completo = preg_replace("#{TESTO}#si", view_text($parti_messaggio[3]), $completo);
 $completo = preg_replace("#{MEX_ID}#si", $x, $completo);
}
$output = ciclo_sub("MESSAGGI", $completo, $output);

$output = preg_replace("#{PAGINAZIONE}#si", create_pagination($pagine_tot, $pagina), $output);

$stile = ( (isset($_GET['stile'])) AND (file_exists("stile/".$_GET['stile'])) ) ? $_GET['stile'] : $stile_base;
$output = preg_replace("#{FILE_STILE}#si", $stile, $output); 


$parti = explode("", $output);
$ciclo = $parti[1];
$completo = "";
foreach (glob("stile/*.css") as $filename)
{
 $completo .= $ciclo;
 $stile_file = substr($filename, 6);
 $stile_nome = str_replace("_", " ", substr(substr($filename, 6), 0, -4 ) );
 $completo = preg_replace("#{STILE_FILE}#si", $stile_file, $completo);
 $selected = ($stile_file == $stile) ? " selected=\"selected\"" : "";
 $completo = preg_replace("#{STILE_SELECTED}#si", $selected, $completo);
 $completo = preg_replace("#{STILE_NOME}#si", $stile_nome, $completo);
}
$output = ciclo_sub("STILI", $completo, $output);

$output = preg_replace("#{QSTRING}#si", qstring_remove("delete"), $output);

if ( (!isset($_SESSION['pugiabook_admin'])) OR ($_SESSION['pugiabook_admin']!=md5($admin_password)) )
{
 $output = hidepart("admin", $output);
}
else
{
 $output = hidepart("admin_login", $output);
}

echo $output;
echo '















		</td>
  </tr>
</table>
	
	</center>
	

	
	
	</div>
	</td>
  </tr>
</table>
	</td>
  </tr>
</table>


	</td>
  </tr>
</table>

	
	</td>
  </tr>
</table>
<table width="780" border="0">
  <tr>
    <td><table height="60" width="780" border="0">
  <tr>
    <td></td>
  </tr>
</table></td>
  </tr>
</table>
</div>
</body>
</html>';
?>

Mi potreste dire qual è l'errore?


Grazie mille a tutti in anticipo