var currentpic = 0

function changeimage(direction) {
	currentpic += direction
	if (currentpic < 0) {
		currentpic = gallery.length - 1
	}
	if (currentpic == gallery.length) {
		currentpic = 0
	}
	var disp = document.getElementById("display")
	if (disp) {
		disp.src = gallery[currentpic]
	}
}