var selected = 1;

	function changePreview(f, n) {
		document.images.preview.src = "imgs/"+f;		
		updateSelected(n);
	}
	
	function updateSelected(n) {
		document.getElementById('n'+selected).style.color = '#6d6d6d';
		document.getElementById('n'+(n)).style.color = '#83c314';
		selected = n;
	}