[Google Maps API v3] Single Marker instead of Multiple Marker

[Eric]

I think topic may have been discussed before but I'm totally new to
here and this API too. As I follow the guide on how to create a map to
let user putting mark on the map. I notice the tutorial showing the
listener event which allow us to put multiple marker. I would like to
change it to only single behalf of the following codes. How can I do
so?

function initialize() {
      var latlng = new google.maps.LatLng(37.4419, -122.1419);
      var options = {
        zoom: 13,
        center: latlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP
      }
      var map = new
google.maps.Map(document.getElementById("map_canvas"), options);
      var html = "<table>" +
                 "<tr><td>Name:</td> <td><input type='text' id='name'/
> </td> </tr>" +
                 "<tr><td>Address:</td> <td><input type='text'
id='address'/></td> </tr>" +
                 "<tr><td>Type:</td> <td><select id='type'>" +
                 "<option value='bar' SELECTED>bar</option>" +
                 "<option value='restaurant'>restaurant</option>" +
                 "</select> </td></tr>" +
                 "<tr><td></td><td><input type='button' value='Save &
Close' onclick='saveData()'/></td></tr>";
    infowindow = new google.maps.InfoWindow({
     content: html
    });

    google.maps.event.addListener(map, "click", function(event) {

                marker = new google.maps.Marker({
          position: event.latLng,
                  title: 'Your House',
          map: map,
                  draggable: true
        });
        google.maps.event.addListener(marker, "click", function() {
          infowindow.open(map, marker);
        });

    });

    }

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