var xmlDoc;
var geocoder = new GClientGeocoder();
var map;

var icon = new GIcon();
icon.image = "http://www.google.com/mapfiles/marker.png";
icon.shadow = "http://www.google.com/mapfiles/shadow50.png";
icon.iconSize = new GSize(20, 34);
icon.shadowSize = new GSize(37, 34);
icon.iconAnchor = new GPoint(10, 34);

function loadXMLDoc(dname) 
{
	try
	{
		if (window.ActiveXObject)  //Internet Explorer
		{
			var errorHappendHere = "Check Browser and security settings";
			xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
			xmlDoc.async=false;
			xmlDoc.load(dname);
		}
		else if(window.XMLHttpRequest)	//Safari
		{
			var errorHappendHere = "Error handling XMLHttpRequest request";
			var d = new XMLHttpRequest();
			d.open("GET", dname, false);
			d.send(null);
			xmlDoc=d.responseXML;
		} else {
			var errorHappendHere = "Error.";	//Firefox, Mozilla, Opera, etc.
			xmlDoc = document.implementation.createDocument("","",null);
			xmlDoc.async=false;
			xmlDoc.load(dname);
		}
	}	
	catch(e)
	{
		alert(errorHappendHere);
	}
  	try
	{
	    return(xmlDoc);
  	}
  	catch(e) {alert(e.message)}
  	return(null);
}

function loadXML(map) 
{
 xmlDoc = loadXMLDoc('latlong.xml');

  t=xmlDoc.getElementsByTagName('town');
  p=xmlDoc.getElementsByTagName("postcode")
  lat=xmlDoc.getElementsByTagName("latitude")
  long=xmlDoc.getElementsByTagName("longitude")

  for (i=0;i<t.length;i++) 
  {
    latitude = lat[i].childNodes[0].nodeValue;
    longitude = long[i].childNodes[0].nodeValue;
    imarker = addMarker(latitude, longitude, t[i].childNodes[0].nodeValue);
    map.addOverlay(imarker);
  }
}

function addMarker(latitude, longitude, description, icon) 
{
  var point = new GLatLng(latitude, longitude);
  var marker = new GMarker(point,icon);
  if (description.length > 0) 
  {
    GEvent.addListener(marker, "click", function() {
     marker.openInfoWindowHtml(description);
    });
    return marker;
  }
}

function usePointFromPostcode(postcode) {
//	Display a marker for the user entered postcode
    geocoder.getLatLng(postcode, function(point) {
        if (!point) {
            //alert('postcode not found');
        } else {
//	Use a blue icon which is 50% larger than the standard red ones.
	    icon.image = "http://labs.google.com/ridefinder/images/mm_20_blue.png";
	    icon.shadow = "http://www.google.com/mapfiles/shadow20.png";
	    icon.iconSize = new GSize(30, 51);
	    icon.shadowSize = new GSize(37, 34);
	    icon.iconAnchor = new GPoint(10, 34);
            var marker = new GMarker(point, icon);
            map.addOverlay(marker);
        }
    });
}

function mapload() {
    if (GBrowserIsCompatible()) {
      map = new GMap2(document.getElementById("map"));
      map.addControl(new GLargeMapControl());
      map.addControl(new GMapTypeControl());
      // View GB map.
      map.setCenter(new GLatLng(54.622978,-2.592773), 6, G_HYBRID_MAP);
      // Display each place with a marker
      loadXML(map);
    }
  }

function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
	  window.onload = func;
  	  } else {
	  window.onload = function() {
	  oldonload();
	  func();
	  }
	}
  }

function addUnLoadEvent(func) {
	var oldonunload = window.onunload;
	if (typeof window.onunload != 'function') {
 	  window.onunload = func;
	  } else {
	  window.onunload = function() {
	  oldonunload();
	  func();
	  }
	}
  }

addLoadEvent(mapload);
addUnLoadEvent(GUnload);