function nextPic(arrow, galerie) {
	var picslength = document.getElementById("picslength"+galerie).value;
	var pic = document.getElementById("pic"+galerie).value;
	if (arrow == "right") {
		pic++;
		if (pic >= picslength) { pic = "0"; }
		}
	if (arrow == "left") {
		pic--;
		if (pic < "0") { pic = picslength-1; }
		}
	var picsname = document.getElementById("galerie"+galerie+"bild"+pic).value;
	document.getElementById("anzeige"+galerie).src = picsname;
	document.getElementById("pic"+galerie).value = pic;
}