function skip(howto)
{
	l = document.getElementById('imgl');
	r = document.getElementById('imgr');

	gLinks += howto;
	gRechts += howto;
	
	if(gLinks < 0) gLinks = gImgs.length-1;
	if(gLinks > gImgs.length-1) gLinks = 0;

	if(gRechts < 0) gRechts = gImgs.length-1;
	if(gRechts > gImgs.length-1) gRechts = 0;

	// zu ladende bilder
	lsrc = gImgs[gLinks];
	rsrc = gImgs[gRechts];

	// vorheriges bild für das linke
	ln = gLinks-1;
	if(ln < 0) ln = gImgs.length-1;
	nlsrc = gImgs[ln];
	nlimg = new Image();
	nlimg.src = nlsrc;
	
	// nächstes bild für das rechte
	rn = gRechts+1;
	if(rn > gImgs.length-1) rn = 0;
	nrsrc = gImgs[rn];
	nrimg = new Image();
	nrimg.src = nrsrc;
	
	l.src = lsrc;
	r.src = rsrc;
}

function skip2(howto)
{
	i = document.getElementById('img');

	gIndex += howto;
	
	if(gIndex < 0) gIndex = gImgs.length-1;
	if(gIndex > gImgs.length-1) gIndex = 0;

	src = gImgs[gIndex];

	// vorheriges bild
	ln = gIndex-1;
	if(ln < 0) ln = gImgs.length-1;
	nlsrc = gImgs[ln];
	nlimg = new Image();
	nlimg.src = nlsrc;
	
	// nächstes bild
	rn = gIndex+1;
	if(rn > gImgs.length-1) rn = 0;
	nrsrc = gImgs[rn];
	nrimg = new Image();
	nrimg.src = nrsrc;	
	
	i.src = src;
}