function initialize() {
      if (GBrowserIsCompatible()) {
        var map = new GMap2(document.getElementById("map_canvas"));
        map.setCenter(new GLatLng(50.444117,-4.119985), 13);
		map.setMapType(G_NORMAL_MAP);
        //map.setUIToDefault();
		map.addControl(new GSmallMapControl());
 // Create a base icon for all of our markers that specifies the
        // shadow, icon dimensions, etc.
        var baseIcon = new GIcon(G_DEFAULT_ICON);
        
        baseIcon.iconSize = new GSize(136, 65);
        baseIcon.shadowSize = new GSize(169, 65);
        baseIcon.iconAnchor = new GPoint(68, 65);
        baseIcon.infoWindowAnchor = new GPoint(130, 10);
		
		baseIcon.imageMap = [0, 0 , 136 , 0, 136, 65, 0 , 65]; //defines clickable area

		
		 function createMarker(point, pin, description) {
		 
		var Icon = new GIcon(baseIcon);
		Icon.image = "img/mappins/" + pin + ".png";
		Icon.shadow = "img/mappins/shadow-" + pin + ".png";
		markerOptions = { icon:Icon };
        var marker = new GMarker(point, markerOptions);
		
		GEvent.addListener(marker, "click", function() {
            marker.openInfoWindowHtml(description);
          });
          return marker;
		}
		
		 var latlng = new GLatLng(50.445833,-4.119686);
		 var pin = "pin1";
		 var des = "<img  class='logo' src='img/maplogo.png' alt='B & R Heating' /><div class='mapaddress'><h3> Unit 6, Devonshire Meadows<br/>Broadley Park Road, Belliver<br />Plymouth, PL6 7EZ<br/><br/>Freephone: 0800 7317054 </div> ";
		map.addOverlay(createMarker(latlng, pin, des));
		
		

		

      }
    }