overflow revien en position aprés passage d'un formulaire

<?php
session_start();
$var = $_SESSION['var'];
if(isset($_GET['lieu']) && $_GET['lieu']=="motcle")
{
$lieu=$_GET['lieu'];
$_GET['lieu']=""; 
header('Location: index.php?#motcle');
$lieu=NULL;
}else{
}
;?>

<A HREF="#motcle">Texte_ou_image_à_cliquer</A>
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<hr>
chiffre qui change : <?php echo $_SESSION['var'];?>
<hr>
<form action="recu.php" method="post"><input type="submit" value="test avec arret 2s"></form>
<br /><A NAME="motcle"><font color="red">Texte_ou_image_formulaire_ce_que_tuveux</font></A><br />,,
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<?php
session_start();
$_SESSION['var']=$chiffre=rand(0,10);;
sleep(2);/*arret 2 s*/
$chiffre=rand(0,10);
header('Location: index.php?lieu=motcle&var='.$chiffre);exit;
?>