function highlight (id) {
	n = id.substring (6);
	document.getElementById('thumb_' + i).className = '';
	document.getElementById('thumb_' + i).childNodes[0].style.visibility = 'hidden';
	document.getElementById('thumb_' + n).className = 'aktiv';
	document.getElementById('thumb_' + n).childNodes[0].style.visibility = 'visible';
	
}

function lowlight (id) {
	n = id.substring (6);
	if (n != i) {
		document.getElementById('thumb_' + n).className = '';
		document.getElementById('thumb_' + n).childNodes[0].style.visibility = 'hidden';
		document.getElementById('thumb_' + i).className = 'aktiv';
		document.getElementById('thumb_' + i).childNodes[0].style.visibility = 'visible';
	} 
}

function lade (id) {
	if (id) n = id.substring (6);
	document.getElementById('bild').src = bilder[n]+'.jpg';
	i = n;
	rolle (id);
}

function nbild () {
	document.getElementById('thumb_' + i).className = '';
	document.getElementById('thumb_' + i).childNodes[0].style.visibility = 'hidden';
	if (++i >= bilder.length) i = 0;
	document.getElementById('bild').src = bilder[i]+'.jpg';
	document.getElementById('thumb_' + i).className = 'aktiv';
	document.getElementById('thumb_' + i).childNodes[0].style.visibility = 'visible';
//	rolle ('thumb_' + i);
	return false;
}

function pbild () {
	document.getElementById('thumb_' + i).className = '';
	document.getElementById('thumb_' + i).childNodes[0].style.visibility = 'hidden';
	if (--i < 0) i = bilder.length-1;
	document.getElementById('bild').src = bilder[i]+'.jpg';
	document.getElementById('thumb_' + i).className = 'aktiv';
	document.getElementById('thumb_' + i).childNodes[0].style.visibility = 'visible';
	return false;
}

function rolle (id) {
	if (id) klick = id.substring (6);
	if (klick >= (anzahl + 19)) {
		anzahl = klick - 4;
		if ((anzahl + 23) > bilder.length) anzahl = bilder.length - 24;
		for (x = 0; x < anzahl; x++) {
			document.getElementById('thumb_' + x).style.display = 'none';
		}
		bis = klick + 23;
		if ((klick + 23) >= (bilder.length - 1)) bis = bilder.length - 1;
		for (x = klick; x < bis; x++) {
			document.getElementById('thumb_' + x).style.display = 'inline';
		}
	}
	if (klick <= (anzahl + 4)) {
		if ((anzahl - 23) < 0) anzahl = 0;
		for (x = anzahl; x < klick; x++) {
			document.getElementById('thumb_' + x).style.display = 'inline';
		}
		for (x = (anzahl + 23); x < bilder.length; x++) {
			document.getElementById('thumb_' + x).style.display = 'none';
		}
	}
}