function isValidEmail(address) {
	if (address.indexOf('@') < 2) return false;

	var period = address.indexOf('.');

	if (period == -1) return false;

	var name = address.substring(0, address.indexOf('@'));
	var domain = address.substring(address.indexOf('@') + 1);

	if (name.indexOf('(') != -1 || name.indexOf(')') != -1 || name.indexOf('<') != -1 || name.indexOf('>') != -1
		|| name.indexOf(',') != -1 || name.indexOf(';') != -1 || name.indexOf(':') != -1 || name.indexOf('\\') != -1 
		|| name.indexOf('"') != -1 || name.indexOf('[') != -1 || name.indexOf(']') != -1 || name.indexOf(' ') != -1)
			 return false;

	if (domain.indexOf('(') != -1 || domain.indexOf(')') != -1 || domain.indexOf('<') != -1 || domain.indexOf('>') != -1
		|| domain.indexOf(',') != -1 || domain.indexOf(';') != -1 || domain.indexOf(':') != -1 
		|| domain.indexOf('\\') != -1 || domain.indexOf('"') != -1 || domain.indexOf('[') != -1 
		|| domain.indexOf(']') != -1 || domain.indexOf(' ') != -1) 
			return false;

	return true;

} /* end of function */