var selectionNr;

/* images */
function nextImg() {
	document.getElementById("slideshow_image" + imgNr).style.display = 'none';
    document.getElementById("slideshow_thumb" + imgNr).src = "images/gallery/" + (imgNr) + ".jpg";
	
	if  (imgNr < imgMax) imgNr++;
	else imgNr = 1;
	    
    document.getElementById("slideshow_image" + imgNr).style.display = 'block';
    document.getElementById("slideshow_thumb" + imgNr).src = "images/gallery/" + (imgNr) + "_on.jpg";	
}

function prevImg() {
	document.getElementById("slideshow_image" + imgNr).style.display = 'none';
    document.getElementById("slideshow_thumb" + imgNr).src = "images/gallery/" + (imgNr) + ".jpg";
	
	if  (imgNr > 1) imgNr--
	else imgNr = imgMax;
	    
    document.getElementById("slideshow_image" + imgNr).style.display = 'block';
    document.getElementById("slideshow_thumb" + imgNr).src = "images/gallery/" + (imgNr) + "_on.jpg";	
}

function setImg(img) {
	document.getElementById("slideshow_image" + imgNr).style.display = 'none';
    document.getElementById("slideshow_thumb" + imgNr).src = "images/gallery/" + (imgNr) + ".jpg";
    
    imgNr = img;
    
    document.getElementById("slideshow_image" + imgNr).style.display = 'block';
    document.getElementById("slideshow_thumb" + imgNr).src = "images/gallery/" + (imgNr) + "_on.jpg";	
}