Probleme variable

<?php
if (!empty($_GET['$A']) and $_GET['$A'] == '1') {$html = '<span>htmlif</span>';}
    else {$html = '<a href="html.php?$A=1&$B">htmlA1</a>';}
?>

<?php
if (!empty($_GET['$B']) and $_GET['$B'] == '1') {$php = '<span>phpif</span>';}
else {$php = '<a href="php.php?$A&$B=1">php222</a>'; }
?>

<?php  
$flash = '<a href="flash.php?page=flash">Flash</a>';
$ref = '<a href="referencement.php?page=referencement">referencement</a>';
$contacts ='<a href="contacts.php?page=contacts">Contacts</a>';
?>

<div id="menus">
<?php echo 'accueil'; ?> 
<?php echo $html; ?> 
<?php echo $php; ?> 
<?php echo $flash; ?> 
<?php echo $ref; ?>
<?php echo $contacts; ?> 
</div><code php>