function checkEMail(inEmail) {
	var locAt;
	var locPeriod;
	var okEmail;

	locAt = inEmail.indexOf("@");
	okEmail = ((locAt != -1) && 
			   (locAt != 0) &&
			   (locAt != (inEmail.length - 1)) &&
			   (inEmail.indexOf("@", locAt + 1) == -1)
			  );
	if (okEmail) {
		// so far, so good
		locPeriod = inEmail.indexOf(".");
		okEmail = ((locPeriod != -1) && (locPeriod != (inEmail.length - 1)) && (locPeriod > locAt));
	}
	
	return okEmail;
}

function alertUser(inEmail) {
	if (checkEMail(inEmail)) {
		return true;
	} else {
		alert("Your e-mail address is invalid.");
		return false;
	}
}