Edit This Code:
<!DOCTYPE html>
<html>
<head>
<script
src="http://maps.googleapis.com/maps/api/js"
>

</script>

<script>
var map;
var london = new google.maps.LatLng(51.508742,-0.120850);

// Add a Home control that returns the user to London
function HomeControl(controlDiv, map) {
  controlDiv.style.padding = '5px';
  var controlUI = document.createElement('div');
  controlUI.style.backgroundColor = 'yellow';
  controlUI.style.border='1px solid';
  controlUI.style.cursor = 'pointer';
  controlUI.style.textAlign = 'center';
  controlUI.title = 'Set map to London';
  controlDiv.appendChild(controlUI);
  var controlText = document.createElement('div');
  controlText.style.fontFamily='Arial,sans-serif';
  controlText.style.fontSize='12px';
  controlText.style.paddingLeft = '4px';
  controlText.style.paddingRight = '4px';
  controlText.innerHTML = '<b>Home<b>'
  controlUI.appendChild(controlText);

  // Setup click-event listener: simply set the map to London
  google.maps.event.addDomListener(controlUI, 'click', function() {
    map.setCenter(london)
  });
}

function initialize() {
  var mapDiv = document.getElementById('googleMap');
  var myOptions = {
    zoom: 12,
    center: london,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }
  map = new google.maps.Map(mapDiv, myOptions);
  // Create a DIV to hold the control and call HomeControl()
  var homeControlDiv = document.createElement('div');
  var homeControl = new HomeControl(homeControlDiv, map);
//  homeControlDiv.index = 1;
  map.controls[google.maps.ControlPosition.TOP_RIGHT].push(homeControlDiv);
}

google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

<body>
<div id="googleMap" style="width:500px;height:380px;"></div>
</body>
</html>


Result:
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