function tikrink_forma() {
	var msg = "";
	msg += "\n";
	var error = false;
	var bad_condition = false;
	var element = null;
	for ( var counter=0; counter < document.feedback.length; counter++ ) {
	element = document.feedback.elements[counter];
		
		switch (element.name) {
			//case "email" : 
				//bad_condition = vemail(element.value);
				//if (bad_condition) msg += "\n - "  
				//break;
			case "telephone" : 
				bad_condition = tuscias(element.value);
				if (bad_condition) msg += "\n - "  
				break;
			case "name" : 
				bad_condition = tuscias(element.value);
				if (bad_condition) msg += "\n - "  
				break;
			case "message" : 
				bad_condition = tuscias(element.value);
				if (bad_condition) msg += "\n - "
				break;
		}		

		if (bad_condition)  {
			error = true;
			bad_condition = false;
		}

	}
	
	if (error) {
		alert(msg);
		return false;
	}
	else
		return true;
}

function tuscias(string) {
	var tuscias = " \n\r\t";
	
	for (var counter = 0; counter < string.length; counter++) {
		current_char = string.charAt (counter)
		if (tuscias.indexOf(current_char) == -1) {
			return false
		}
	}
	return true
}

function vemail(string) {
	if (document.feedback.email.value == "" ||
		document.feedback.email.value.indexOf('@') == -1 ||
		document.feedback.email.value.indexOf('.') == -1 ||
		document.feedback.email.value.length < 6) {
			return true;
	}
	else {
		return false;
	}
}