function showBox(boxname){
	$(boxname).removeClass('hidden');
}

function hideBox(boxname){
	$(boxname).addClass('hidden');
}

function toggleBox(boxname){
	$(boxname).toggleClass('hidden');
	$(boxname).toggleClass('unhidden');
}

function chooseTeacher(profile){
	
	// hide all profiles
	hideBox('#profile1');
	hideBox('#profile2');
	hideBox('#profile3');
	hideBox('#profile4');
	hideBox('#profile5');
	hideBox('#profile6');
	hideBox('#profile7');
	hideBox('#profile8');
	hideBox('#profile9');
	
	// deselect all links
	$('#link1').removeClass('selected');
	$('#link2').removeClass('selected');
	$('#link3').removeClass('selected');
	$('#link4').removeClass('selected');
	$('#link5').removeClass('selected');
	$('#link6').removeClass('selected');
	$('#link7').removeClass('selected');
	$('#link8').removeClass('selected');
	$('#link9').removeClass('selected');
	
	// select chosen link
	$('#link' + profile).addClass('selected');
	
	// show chosen profile
	showBox('#profile' + profile);
}