at area. This is so that the user can
      // show all listings, then decide to focus on one area of the map.
      function zoomToArea() {
        // Initialize the geocoder.
        var geocoder = new google.maps.Geocoder();
        // Get the address or place that the user entered.
        var address = document.getElementById('zoom-to-area-text').value;
        // Make sure the address isn't blank.
        if (address == '') {
          window.alert('You must enter an area, or address.');
        } els