// JavaScript Document
function nextPicture() {
	// Hide current picture
	object = document.getElementById('slide' + current);
	object.style.display = 'none';
		  
	// Show next picture, if last, loop back to front
	if (current == last) { current = 1; }
	else { current++ }
	object = document.getElementById('slide' + current);
	object.style.display = 'block';
 }

 function previousPicture() {
	// Hide current picture
	object = document.getElementById('slide' + current);
	object.style.display = 'none';
		  
	if (current == first) { current = last; }
	else { current--; }
	object = document.getElementById('slide' + current);
	object.style.display = 'block';
}