function userTypeChange() {
	
	var userType = document.getElementById('userType').selectedIndex;
	
	switch (userType) {
	case 1:
		/* eTutor */
		document.getElementById('eTutorsUsernameRow').style.visibility = 'hidden';
		break;
	default:
		/* student */
		document.getElementById('eTutorsUsernameRow').style.visibility = 'visible';
	}
}