var currentslide=2;

function nextSlide(collection, product, maxslides) {
	var	imageAngle = 'images/' + collection + '/' + product + '_' + currentslide + '.jpg';

	if(document.images) {
		document.images[product].src=imageAngle;
		currentslide++;
		if(currentslide>maxslides) currentslide=1;
	}
}