function quizSwapImage(thisImg) {
	if (thisImg != 'image1') {
		quizResetImage('image1');
	}
	if (thisImg != 'image2') {
		quizResetImage('image2');
	}
	if (thisImg != 'image3') {
		quizResetImage('image3');
	}
	document.getElementById(thisImg).style.display = 'block';
	document.getElementById(thisImg + 'thumb').style.border = '1px solid rgb(200,200,100)';
}

function quizResetImage(thisImg) {
	if (document.getElementById(thisImg) && document.getElementById(thisImg + 'thumb')) {
		document.getElementById(thisImg).style.display = 'none';
		document.getElementById(thisImg + 'thumb').style.border = '1px solid rgb(192,192,192)';
	}
}