le code il est bon...
peut etre que j'ai trouvé la solution:
if (isset($_POST['Q6_1'])) $Q6_1=$_REQUEST['Q6_1']; else $Q6_1= NULL;
if (isset($_POST['Q6_2'])) $Q6_2=$_REQUEST['Q6_2']; else $Q6_2= NULL;
if (isset($_POST['Q6_3'])) $Q6_3=$_REQUEST['Q6_3']; else $Q6_3= NULL;
if (isset($_POST['Q6_4'])) $Q6_4=$_REQUEST['Q6_4']; else $Q6_4= NULL;
if (isset($_POST['Q6_5'])) $Q6_5=$_REQUEST['Q6_5']; else $Q6_5= NULL;
if (isset($_POST['Q6_6'])) $Q6_6=$_REQUEST['Q6_6']; else $Q6_6= NULL;

