function validate(messageTextBoxMaxLength) {
	var message = '';
	with (document.forms[0]) {
		if (TellAFriendControl1_YourEmailTextBox.value == '') {
			message += '\n- Your e-mail field is required.';
		} else {
			if (!isEmail(TellAFriendControl1_YourEmailTextBox.value)) message += '\n- Your e-mail field is not valid.';
		}
		if (TellAFriendControl1_FriendEmailTextBox.value == '') {
			message += '\n- Friend\'s e-mail field is required.';
		} else {
			if (!isEmail(TellAFriendControl1_FriendEmailTextBox.value)) message += '\n- Friend\'s e-mail field is not valid.';
		}
		if (TellAFriendControl1_MessageTextBox.value.length > messageTextBoxMaxLength) message += '\n- Message field must have ' + messageTextBoxMaxLength + ' characters at the most.';
	}
	if (message != '') {
		alert(message.substr('\n'.length));
		return false;
	}
}