function ValidaFormEnquete(form) {

	for (i = 0; i < form.elements.length; i++) { 
		if (form.elements[i].type == 'radio') {
			
			rb = document.getElementsByName(form.elements[i].name);
			
			ctd = 0;
			for (j = 0; j < rb.length; j++) {
				if (rb[j].checked == true) {
					ctd++;
				}
			}
			
			if (ctd == 0) {
				alert('Favor responder todas perguntas.');
				return false;
			}
		}
	}
	
	return true;
}