function validateNews(thisForm){
	var valid = true;

	var A = $('A');		//e-mail
	Element.extend(A);

	clearErrors();
	if(!isEmail(A)){
		setError(A,'errA',INCORRECT_EMAIL);
		valid=false;
	}

	if(!valid){
		return false;
	}else{
		return true;
	}
}

function validateNewsletter(thisForm){
	var valid = true;

	var A = $('A');		//temat
	var B = $('B');		//treść
	Element.extend(A);
	Element.extend(B);

	clearErrors();

	if(!hasCorrectLength(A,NEWSLETTER_SUBJECT_START,NEWSLETTER_SUBJECT_STOP)){
		setError(A,'errA',NEWSLETTER_SUBJECT_LENGTH);
		valid=false;
	}

	if(!isNotNull(B)){
		setError(B,'errB',NEWSLETTER_CONTENT_IS_NULL);
		valid=false;
	}

	if(!valid){
		return false;
	}else{
		return true;
	}
}