// JavaScript Document

first = 1;
    last = 15;
    current = 1;
           
           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 getPicture1() {
               // Hide current picture
               object = document.getElementById('slide' + current);
               object.style.display = 'none';
               
               
               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'; 
           }