gistfile1.js

googlemap.dropMarker = function($element) {
  var myLatlng = new google.maps.LatLng($element.data('lat'),$element.data('long')),
      marker = new google.maps.Marker({
        position: myLatlng,
        map: map, 
        title: $element.data('name')
      }),
      infowindow = new google.maps.InfoWindow({
        content: $element.data('name') + '<br/>' +  $element.data('address') 
      });

  // gather all info windows so you can close them when opening a new one.
  googlemap.infowindows.push(infowindow);

  google.maps.event.addListener(marker, 'click', function() {
    _.each(googlemap.infowindows,function(infowindow) {
      infowindow.close();
    });
    infowindow.open(map, marker);
  });
};