function checkForm(myForm) {
	var btn = $('btn_submit');
	var url = 'rpc.php';
	var target = 'captcha_check_result';
	var pars = 'security_code='+escape($F('security_code'));
	if (! myForm) {
		alert('Can\'t find myForm');
		return(false);
	}

	new Ajax.Request(
		url,
		{
			method: 'get',
			parameters: pars,
			onSuccess: function(transport) {
				if (transport.responseText !== '') {
					$(target).innerHTML = transport.responseText;
					$(target).style.display = 'block';
					myForm.myTimer.stopTimer();
					return(false);
				} else {
					btn.disabled = 'true';
					btn.value = 'invio in corso';
					myForm.submit();
					return(false);
				}
			},
			onFailure: function() {
				alert('ajax error') 
			}
		});

	return(false);
}

function formSubmit() {
	if (! $('fileForm').myTimer) {
		$('fileForm').myTimer = new clsTimer('timer_value');
		$('fileForm').myTimer.startTimer(); 
	}
	checkForm($('fileForm'));
	return(false);
}