Google maps jQuery plugin load markers with JSON example

<script src="http://maps.google.com/maps/api/js?sensor=true" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/jquery-ui.min.js" type="text/javascript"></script>
<script src="PATH_TO_PLUGIN/jquery.ui.map.js" type="text/javascript"></script>

<script type="text/javascript">
	$(function() {
		var latlng = new google.maps.LatLng(59.3426606750, 18.0736160278);
		$('#map_canvas').gmap({ 'center':latlng, 'callback': function() {
				$('#map_canvas').gmap('loadJSON', 'http://jquery-ui-map.googlecode.com/svn/trunk/demos/json.json', 'category=activity', function(i, m) {
					$('#map_canvas').gmap('addMarker', { 'position': new google.maps.LatLng(m.lat, m.lng) } );
				});
			}
		});
	});
</script>