Another LoadVars problem

I try to get a variable from php :

I have a boutton with :

on (release) {

              $myLoadVars = new LoadVars();
              $myLoadVars_received = new LoadVars();

              $myLoadVars.var_to_php = myComboBox.getSelectedItem().label; 

$myLoadVars.sendAndLoad ( “script.php”,$myLoadVars_received);

$affich_var = $envelope_received.var_from_php;
}

PHP //
script.php :

<?
$result = mysql_query( “select counter from data_base where data1=’”.$_POST[‘var_to_php’]."’");

$counter = mysql_fetch_row($result);

echo ("&var_from_php=$counter[0]");
?>

=> my result of all this : nothing happens. no variable is received from php. ( the is no request ( from the firewall ) from flash to access the internet )

so I think the error is around the sendandload.

any suggestions ???

by the way, the php script works perfectly with loadVariablesNum

thanks for your help!