function start_slideshow(start_frame, end_frame, delay) {
	        setTimeout(switch_slides(start_frame,start_frame,end_frame, delay), delay);
	    }
	                            
	    function switch_slides(frame, start_frame, end_frame, delay) {
	        return (function() {
	            Effect.Fade('slideshow' + frame);
	            if (frame == end_frame) { frame = start_frame; } else { frame = frame + 1; }
	            setTimeout("Effect.Appear('slideshow" + frame + "');", 0);
	            setTimeout(switch_slides(frame, start_frame, end_frame, delay), delay);
	        })
	    }



	    function switch_slides_2() {
	    	document.getElementById('dummy' + frame).style.display = "block";
	        Effect.Appear("slideshow" + frame);
	    }
	    function switch_slides_plus() {
	    	if (end_frame > 1){
		        if ((frame+1) < end_frame){
		        	frame++;
		        } else {
		        	frame = 0;
		        	overflow = 1;
		        }
		    	if (frame > 0){
		    		// ausfaden altes bild
		        	Effect.Fade("slideshow" + (frame-1));
		    		document.getElementById('dummy' + (frame-1)).style.display = "none";
		        }
		        if (overflow == 1){
		    		// ausfaden altes bild
		        	Effect.Fade("slideshow" + (end_frame-1));
		    		document.getElementById('dummy' + (end_frame-1)).style.display = "none";
		        	overflow = 0;
		        }
		    	document.getElementById('dummy' + frame).style.display = "block";
		        Effect.Appear("slideshow" + frame);
			}
	    }
	    function switch_slides_minus() {
	    	if (end_frame > 1){
		        if ((frame-1) < 0){
		        	frame = end_frame-1;
		        	overflow = 1;
		        } else {
		        	frame--;
		        }
		    	if (frame >= 0 && frame < (end_frame-1)){
		    		// ausfaden altes bild
		    		document.getElementById('slideshow' + (frame+1)).style.display = "none";
		    		document.getElementById('dummy' + (frame+1)).style.display = "none";
		        }
		        if (overflow == 1){
		    		// ausfaden altes bild
		        	Effect.Fade("slideshow" + (0));
		    		document.getElementById('dummy0').style.display = "none";
		        	overflow = 0;
		        }
		        // neues bild einblenden
		    	document.getElementById('dummy' + frame).style.display = "block";
		        Effect.Appear("slideshow" + frame);
			}
	    }
	    function bigger(){
	    	document.getElementById("pic"+frame).style.display = "block";
	    }