old_contents: (function() {
    // don't emit events from inside the previews themselves
    var qs = window.location.href.split('?');
    if (qs.length > 1 && qs[1].match('receiver')) { return; }
  
    var socket = io.connect(window.location.origin);
    var socketId = socket.socket.sessionid;
    console.log('View slide notes at ' + window.location.origin + '/_notes/' + socketId);
  
    Reveal.addEventListener( 'slidechanged', function( event ) {
      var nextindexh;
      var nextindexv;
      var slideElement = event.currentSlide;
  
      if (slideElement.nextElementSibling && slideElement.parentNode.nodeName == 'SECTION') {
        nextindexh = event.indexh;
        nextindexv = event.indexv + 1;
      } else {
        nextindexh = event.indexh + 1;
        nextindexv = 0;
      }
  
      var notes = slideElement.querySelector('aside.notes');
      var slideData = {
        notes : notes ? notes.innerHTML : '',
        indexh : event.indexh,
        indexv : event.indexv,
        nextindexh : nextindexh,
        nextindexv : nextindexv,
        socketId : socketId
      };
  
      socket.emit('slidechanged', slideData);
    } );
  }());
  
new_contents: (function() {
    // don't emit events from inside the previews themselves
    var qs = window.location.href.split('?');
    if (qs.length > 1 && qs[1].match('receiver')) { return; }
  
    var socket = io.connect(window.location.origin);
    var socketId = Math.random().toString().slice(2);
    console.log('View slide notes at ' + window.location.origin + '/_notes/' + socketId);
  
    Reveal.addEventListener( 'slidechanged', function( event ) {
      var nextindexh;
      var nextindexv;
      var slideElement = event.currentSlide;
  
      if (slideElement.nextElementSibling && slideElement.parentNode.nodeName == 'SECTION') {
        nextindexh = event.indexh;
        nextindexv = event.indexv + 1;
      } else {
        nextindexh = event.indexh + 1;
        nextindexv = 0;
      }
  
      var notes = slideElement.querySelector('aside.notes');
      var slideData = {
        notes : notes ? notes.innerHTML : '',
        indexh : event.indexh,
        indexv : event.indexv,
        nextindexh : nextindexh,
        nextindexv : nextindexv,
        socketId : socketId
      };
  
      socket.emit('slidechanged', slideData);
    } );
  }());
  
subject: fix socket id