// "newimg" is the image's name minus its file extension.

function swap(id, newimg) {
	var me = document.getElementById(id);	
	me.src = newimg;
}
function clear() {
	document.getElementById('thumb1').src = 'front_none.jpg';
	document.getElementById('thumb2').src = 'back_none.jpg';
	document.getElementById('thumb3').src = 'closeup_none.jpg';
}