GoogleMaps v3 API Create only 1 marker on click

var marker;

function placeMarker(location) {
  if ( marker ) {
  } else {
    marker = new google.maps.Marker({
      position: location,
      map: map

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

You have to work on the same marker all the time – do not create new ones.
Here you have a global variable marker and in placeMarker function you assign marker to this variable first time. Next time it checks that marker exists already and then just changes its position.

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