"Cannot modify header"

Spravil som si vtipy a vypisuje mi to:
Warning: Cannot modify header information - headers already sent by (output started at /3w/czweb.org/g/gajdosiktom/anketa.php:124) in /3w/czweb.org/g/gajdosiktom/vtip.php on line 12

moja stranka

Zdrojovy kod vtipov

<?php
$maxvtip= "vtipy/vtipy/maxvtip.dat";

if(isset($HTTP_COOKIE_VARS['vtipy'])){
$vtipcookie = $HTTP_COOKIE_VARS['vtipy'];
$vtipfile="vtipy/vtipy/$vtipcookie.dat";
$vtipfile2=FOpen($vtipfile,"r");//nacita vtipfile
$vtipfile3=fread($vtipfile2,filesize($vtipfile));

$maxvtip2=FOpen($maxvtip,"r");$maxvtip3=fread($maxvtip2,filesize($maxv tip));
if ($vtipcookie<$maxvtip3){$vtipcookiezapis=$vtipcookie +1;}else{$vtipcookiezapis=1;}
setcookie('vtipy', $vtipcookiezapis, time()+1999999);

}else{setcookie('vtipy', '1', time()+1999999);
$vtipfile="vtipy/vtipy/1.dat";
$vtipfile2=FOpen($vtipfile,"r");
$vtipfile3=fread($vtipfile2,filesize($vtipfile));}

echo $vtipfile3; ?>

riadok 124 v ankete je:
<tr><td>Celkom</td><td><?php echo $celkom3; ?></td></tr>

problem je len ked ste klikli v menu na clanky alebo ked ste si moju stranku len teraz nacitali.
Cize sa to zobrazuje len pri clankoch!

Problem som nasiel je to v indexe:

<?php
if ($menu=="clanky"){
include "clanky.php";}
elseif($menu=="fotogaleria"){
include "foto1.htm";}
elseif($menu=="anketa"){
include "anketa.php";}
elseif($menu=="pocitadlo"){
include "pocitadlo.php";}
elseif($menu=="vtip"){
include "vtip.php";}
elseif ($menu=="kontakt"){
include "kontakt.php";}
elseif($menu=="clanokview"){
include "clanokview.php";}

else {include "clanky.php";}

?>

Ked somto vyhodil, islo to v pohode.