function is_email_format_valid(email) {
	if (/^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$/.test(email)){
	return (true)
}
	return (false)
}

function trimLeft(s) {
	if (s.length == 0) return s;
	i = s.indexOf(' '); 
	if (i==0) {
		s = s.substring(1, s.length);
		s = trimLeft(s);
		return s;
	}
	return s;
}

function trimRight(s) {
	if (s.length == 0) return s;
	i = s.lastIndexOf(' '); 
	if (i == s.length - 1) {
		s = s.substring(0, s.length - 1);
		s = trimRight(s);
		return s;
	}
	return s;
}

function trim(s) {
	s = trimLeft(s);
	s = trimRight(s);
	return s;
}