ById('hide-listings').addEventListener('click', hideListings);

        document.getElementById('toggle-drawing').addEventListener('click', function() {
          toggleDrawing(drawingManager);
        });

        document.getElementById('zoom-to-area').addEventListener('click', function() {
          zoomToArea();
        });

        document.getElementById('search-within-time').addEventListener('click', function() {
          searchWithinTime();
        });

        // Add an event listener so that the 