function checkEmail(strng) {
	var error = ""
	var illegalChars= /[\(\)\<\>\,\;\:\\\/\"\[\]]/
	var badEmail = /(@.*@)|(\.\.)|(@\.)|(\.@)|(^\.)/;
	var goodEmail = /^.+@.+\..{2,4}$/

	if ( strng.match(badEmail) || strng.match(illegalChars) )
	{
		error = "Please enter a valid email address.\n";
	}
	else if (!(goodEmail.test(strng)))
	{ 
		error = "Please enter a valid email address.\n";
	}
	return error;
}