function
validateScreen() {
	var returnVal = true;
	
	var nameObj = document.email.sender_name;
	var emailObj = document.email.sender_email;
	var phoneObj = document.email.telephone;
	var msgObj = document.email.message;
	
	if (! sendForm() || ! checkName(nameObj) || ! checkEmailAddress(emailObj) || ! checkTelephone(phoneObj) || ! checkIsNull(msgObj)) {
		returnVal = false;
		clrDCguard();
	}
	return returnVal;
}