<script>
 AJS.toInit(function (){
	var iframe = AJS.$('#checkout_annual'); 
    var iframeSrc = 'https://gsvlabs.as.me/catalog.php?owner=16697280&action=addCart&clear=1&id=581354&certificate=JOETROYER50&firstName=' + userFirstName + '&lastName=' + userLastName + '&email=' + userEmail; 
    iframe.attr('src' , iframeSrc); 
});
</script>
<iframe id="checkout_annual" width="100%" height="800" frameBorder="0"></iframe>