displaying lat lng wherever user wanna click

i want to display lattitude and longitude a location that user click on the map wherever them wants (im not using marker event). but it still want shows. here is my code

 var myCenter=new google.maps.LatLng(51.508742,-0.120850);

    function initialize()
    {
    var mapProp = {
      center:myCenter,
      zoom:5,
      mapTypeId:google.maps.MapTypeId.ROADMAP
      };

    var map=new google.maps.Map(document.getElementById("googleMap"),mapProp);

    var marker=new google.maps.Marker({
      position:myCenter,
      });

    marker.setMap(map);

    var infowindow = new google.maps.InfoWindow();

    google.maps.event.addListener(map, 'click', function(event) 
    {
    infowindow.setContent(event.LatLng.lat()+","+event.latlng.lng());
      infowindow.open(map,marker);
      });
    }

    google.maps.event.addDomListener(window, 'load', initialize);

anybody can help?? thanks..