function toggle() {
          var slideColl = GetElementsWithClassName('*','slide');
          var slides = document.getElementById('slideProj');
          var outline = document.getElementById('outlineStyle');
          if (!slides.disabled) {
                  slides.disabled = true;
                  outline.disabled = false;
                  s5mode = false;
                  fontSize('1em');
                  for (var n = 0; n < smax; n++) {
                          var slide = slideColl[n];
                          slide.style.visibility = 'visible';
                  }
          } else {
                  slides.disabled = false;
                  outline.disabled = true;
                  s5mode = true;
                  fontScale();
                  for (var n = 0; n < smax; n++) {
                          var slide = slideColl[n];
                          slide.style.visibility = 'hidden';
                  }
                  slideColl[snum].style.visibility = 'visible';
          }
  }