function fade(step) {
            var imgs = document.getElementById("wechsel").getElementsByTagName("img");
            step = step || 0;
            imgs[aktuell].style.opacity = step/100;
            imgs[aktuell].style.filter = "alpha(opacity=" + step + ")";  
			imgs[vorgaenger].style.opacity = (1- (step/100));
            imgs[vorgaenger].style.filter = "alpha(opacity=" + (100 - step) + ")"; 
			step = step + 2;
				if (step <= 100) {
					window.setTimeout(function () { fade(step); }, 150);
				}
				else
				{
					step = 0;
					window.setTimeout(function () { next(); }, 10000);
				}
			
        }

        function next() {
            var imgs = document.getElementById("wechsel").getElementsByTagName("img");
            if (typeof(aktuell) != "number") {
                aktuell = 0;
				vorgaenger = imgs.length - 1;
            }
			else
			{
            aktuell++;
			vorgaenger = aktuell -1;
			}
            if (aktuell < imgs.length) {
				step = 0;
                fade();
            }
			else {
			aktuell = 0;
			vorgaenger = imgs.length -1;
			step = 0;
			fade();
			}
        };