function changeItem(nr) {
	arrLabels = document.getElementsByTagName('label');
	var total = 0;
	
	for (var i = 0; i < arrLabels.length; i++) {
		if (arrLabels[i].getAttributeNode('for').value == 'gallery') {
			imt = i + 1;
			document.getElementById(arrLabels[i].getAttributeNode('id').value).style.display = 'none';
			document.getElementById('numb_' + imt).className = '';
			total++;
		}
	}
	
	//curr = total - (nr-1);
	curr = nr;

	for (var i = 0; i < arrLabels.length; i++) {
		if (arrLabels[i].getAttributeNode('for').value == 'description') {
			document.getElementById(arrLabels[i].getAttributeNode('id').value).style.display = 'none';
		}
	}
	
	document.getElementById('media_' + nr).style.display = 'block';
	document.getElementById('desc_' + nr).style.display = 'block';
	document.getElementById('numb_' + curr).className = 'pic_selected';
}