anchor.diff:          }
           self.$currentSelection.addClass("selected");
         },
  +      advanceIfInvisible : function() {
  +        self.next();
  +      },
         next : function() {
           var $item = this.$currentSelection;
           while (true) {
  
positive.code:         type: "POST",
          success : function() {
            $button.html(verb == "mute" ? "Unmute" : "Mute");
            if (verb == "mute") {
              $button.parent().parent().addClass("muted");
            } else {
              $button.parent().parent().removeClass("muted");
            }
            var displayValue = $("#muteButton").hasClass("active") ? "none" : "table-row";
            $(".muted").css("display", displayValue);
          }
        });
  
negative.code:       }
      });
      $('.toggle-visibility button').click(function(e) {
        var $target = $(e.target), displayValue;
        if ($target.attr("id") == 'inactiveButton') {
          displayValue = $target.hasClass("active") ? "block" : "none";
          $("#inactiveTrucks").css("display", displayValue);
        } else {
          displayValue = $target.hasClass("active") ? "table-row" : "none";
          $(".muted").css("display", displayValue);
        }
        if ($target.hasClass("active")) {
  