var currentIndex = 0;

	function getCurrentPic(index) {
	  var current = document.getElementById("currentPic");
	    if (index < 0) {
		  currentIndex = 0;
		} else if (index == pictures.length) {
		  currentIndex = pictures.length - 1;
		} else {
		  currentIndex = index;
		}

		if (currentIndex == 0 ) {
		  document.getElementById('prev').style.display = 'none';
		} else {
		  document.getElementById('prev').style.display = '';
		}
		  current.src = directory + pictures[currentIndex];
		}

		function disableLink() {
		  return false;
		}