Changes

setup: function() { this.sections = []; this.pos = 0; var body = document.getElementsByTagName('body')[0]; this.orig_markup = body.innerHTML; var markup = body.innerHTML; var start = 0; var end = markup.indexOf('<span class="editsection"'); while (end != -1) { start = markup.indexOf('</span>', end); end = markup.indexOf('<span class="editsection"', start); if (end == -1) { end = markup.indexOf('<div class="printfooter">', start); this.sections.push(markup.substr(start, end - start)); end = -1; } this.sections.push(markup.substr(start, end - start)); } if (this.sections.length > 0) { var div = document.getElementById('bodyContent'); var link = div.insertBefore(document.createElement('a'), div.firstChild); link.innerHTML = 'Start presentation'; link.setAttribute('href', '#presentation'); link.addEventListener('click', this.start, false); } }, start: function() { var body = document.getElementsByTagName('body')[0]; body.innerHTML = ''; body.style.textAlign = 'center'; var prev = body.appendChild(document.createElement('a')); prev.innerHTML = '&larr; Prev'; prev.setAttribute('href', '#prev'); prev.style.font = '11px verdana, sans-serif'; prev.addEventListener('click', function() { wikipedia_presentation.prev(); }, false); body.appendChild(document.createTextNode(' / ')); var stop = body.appendChild(document.createElement('a')); stop.innerHTML = 'Exit'; stop.setAttribute('href', '#exit'); stop.style.font = '11px verdana, sans-serif'; stop.addEventListener('click', function() { wikipedia_presentation.stop(); }, false); body.appendChild(document.createTextNode(' / ')); var next = body.appendChild(document.createElement('a')); next.innerHTML = 'Next &rarr;'; next.setAttribute('href', '#next'); next.style.font = '11px verdana, sans-serif'; next.addEventListener('click', function() { wikipedia_presentation.next(); }, false); var slide = body.appendChild(document.createElement('div')); slide.setAttribute('id', 'wikipedia_presentation'); slide.style.width = '500px780px'; slide.style.margin = '100px auto10px 10px 10px 20px'; slide.style.textAlign = 'left'; slide.style.font = '2em verdana, sans-serif'; slide.innerHTML = wikipedia_presentation.sections[0]; var items = slide.getElementsByTagName('li'); for (var i = 1; i < items.length; i++) { items[i].style.display = 'none'; } document.addEventListener('keypress', wikipedia_presentation.keypress, false); }, stop: function() { var body = document.getElementsByTagName('body')[0]; body.innerHTML = wikipedia_presentation.orig_markup; body.style.textAlign = 'left'; wikipedia_presentation.setup(); document.removeEventListener('keypress', wikipedia_presentation.keypress, false); }, keypress: function(event) { if (event.keyCode == 39) { wikipedia_presentation.next(); } else if (event.keyCode == 37) { wikipedia_presentation.prev(); } }, prev: function() { this.pos--; if (this.pos == -1) { this.pos = this.sections.length - 1; } var slide = document.getElementById('wikipedia_presentation'); slide.innerHTML = wikipedia_presentation.sections[this.pos]; }, next: function() { var slide = document.getElementById('wikipedia_presentation'); var items = slide.getElementsByTagName('li'); var hidden = 0; for (var i = 0; i < items.length; i++) { if (items[i].style.display == 'none') { hidden++; } } if (hidden > 0) { items[items.length - hidden].style.display = 'list-item'; return; } this.pos++; if (this.pos == this.sections.length) { this.pos = 0; } slide.innerHTML = wikipedia_presentation.sections[this.pos]; var items = slide.getElementsByTagName('li'); for (var i = 1; i < items.length; i++) { items[i].style.display = 'none'; } }