function showPicNext (imageUrl, maxImage, photogallery, lan) {
	 if (document.getElementById) {
		 var imagePos = parseInt(document.getElementById('next').name)
		 if ((imagePos + 1) <= maxImage)  {
			  document.getElementById('previous').className = 0;
			  document.getElementById('contentImage').style.background = "url(" + imageUrl + "img_" + (imagePos + 1) + "_" + lan + ".jpg" + ")";
			  document.getElementById('next').name = (imagePos + 1);
			  document.getElementById('picNumber').innerHTML = imagePos + 1;
			  			   if (imagePos+1 == maxImage)  {
			 	document.getElementById('next').className = 'visitedPhotos';
			 }
			  return false;
		 } else {
			 return true;
		 }
	}
}

function showPicPrevious (imageUrl, photogallery, lan) {
	 if (document.getElementById) {
		 var imagePos = parseInt(document.getElementById('next').name)
		  if ((imagePos - 1) != 0)  {
			  document.getElementById('next').className = 0;
			  document.getElementById('contentImage').style.background = "url(" + imageUrl + "img_" + (imagePos - 1) + "_" + lan + ".jpg" + ")";
			  document.getElementById('next').name = (imagePos - 1);
			  document.getElementById('picNumber').innerHTML = imagePos - 1;
		  			   if (imagePos-1 == 1)  {
				document.getElementById('previous').className = 'visitedPhotos';
			 }
		  return false;
	 } else {
		  return true;
	 }
	}
}