Incoming events can be filtered according to session filter

    ).append(listElem);

    var eventsPolledUntil = false;

    var eventsFilter = [];

    var eventsFilter = {uncheckedTypes: [], checkedSessions: []};

    var sessionData = {};

    var pollRunning = true;

          _unchecked_types.push($(v).attr('rel'));

        }

      });

      eventsFilter = _unchecked_types;

      eventsFilter.uncheckedTypes = _unchecked_types;

      var _checked_sessions = [];

      $('ul.session_list li.session').each(function(i,v){

        if($('input', v).attr('checked')){

          _checked_sessions.push($(v).data().session);

        }

      });

      eventsFilter.checkedSessions = _checked_sessions;

    }

    function doEventsPoll(){

      return (function(_data, _status){

        var data = JSON.parse(_data)

        var events = data.events;

        var timout = 1000;

        var timeout = 1000;

        var maxevents = 200;

        var passesFiltering = function(event_data) {

          var passes_type_filtering = false;

          var passes_session_filtering = false;

          if(eventsFilter.uncheckedTypes.indexOf(event_data._type) == -1) {

            if(parseInt(v._time)<=eventsPolledUntil) {

              passes_type_filtering = true;

            }

          }

          if(!passes_type_filtering) return false;

          if(eventsFilter.checkedSessions.length == 0){

            return true; // No filter set - show all events

          } else {

            if(event_data._session_key){

              if(eventsFilter.checkedSessions.indexOf(event_data._session_key) >= 0){

                return true; // Filter set and match

              } else {

                return false; // Filter set but no match

              }

            } else {

              return false; // Filter set but event is not associated with session

            }

          }

        }

        if(events.length > 0){

          timeout = 200;

          eventsPolledUntil = parseInt(events[0]._time)-1;

        }

	      for(var n=events.length-1; n >= 0; n--){

	        var v = events[n];

          if(eventsFilter.indexOf(v._type) == -1){

            if(parseInt(v._time)<=eventsPolledUntil){

          if(passesFiltering(v)) {

            renderEvent(v);

          }

          }

        };

        var elems = $("p", feedInnerElem);

        for(var n=maxevents; n < elems.length; n++){

          $(elems[n]).remove();

        }

        if(pollRunning){

          window.setTimeout(doEventsPoll(), timout);

          window.setTimeout(doEventsPoll(), timeout);

        }

      });

    };

    function updateSession(session_data){

      sessionData[session_data.session_key] = session_data;

      var session_key = session_data.session_key;

      if(!sessionData[session_key]){

        updateEventFilter()

      }

      sessionData[session_key] = session_data;

      renderSession(session_data);

    }

        listElem.append(

          $('<li class="session"></li>').append(

            $('<input type="checkbox" />').click(function(){ updateEventFilter(); })

          ).append(

            $('<div class="picture"></div>').html(session_picture)

          ).append(

            $('<span class="name"></span>').html(session_name)