var myMap = null;
var mypoint=null;
function createMarker(point) {

  // Set up our GMarkerOptions object
  var marker = new GMarker(point);

  return marker;
}

function displayMap(lat,lon) {
  myMap = new GMap2(document.getElementById("map"));
  
  mypoint=new GLatLng(lat,lon);
  myMap.setUIToDefault();
  
  myMap.addControl(new GMapTypeControl());
  
  myMap.enableScrollWheelZoom();

  var marker = createMarker(mypoint);
	myMap.addOverlay(marker);  

  myMap.setCenter(mypoint, 13);
}