var index = 0;

function next() {
	index++;
	if (index == images.length) {
		index = 0;
	}
	$('imageContainer').innerHTML = '<img src="' + images[index]+ '"></img>';
}

function previous() {
	index--;
	if (index < 0) {
		index = images.length - 1;
	}
	$('imageContainer').innerHTML = '<img src="' + images[index]+ '"></img>';
}