function showTimer(value,time) {
                  var currSlide = slides.whichChoice;
                  var slide     = slides.choice[currSlide];
                  if(value) {
                      if(slide.showEffect == -1) {
                          effect = Math.round(Math.random()*
                                          effects.show.length);
                          if(effect >= effects.show.length)  {
                              effect=0;
                          }
                      } else {
                          effect = slide.showEffect;
                      }
                      Browser.addRoute(effects.show[effect],
                                       'translation',
                                       slide,
                                       'translation');
                      Browser.addRoute(effects.show[effect],
                                       'rotation',
                                       slide,
                                       'rotation');
                      Browser.addRoute(showTimeSensor,
                                       'fraction_changed',
                                       effects.show[effect],
                                       'set_fraction');
                      effects.show[effect].set_fraction = 0.0;
                  } else {
                      Browser.deleteRoute(effects.show[effect],
                                          'translation',
                                          slide,
                                          'translation');
                      Browser.deleteRoute(effects.show[effect],
                                          'rotation',
                                          slide,
                                          'rotation');
                      Browser.deleteRoute(showTimeSensor,
                                          'fraction_changed',
                                          effects.show[effect],
                                          'set_fraction');
                  }
              }