function premapLoad()
    {
    mapLoad(lat, lng, zm, ptlat, ptlng);
    }

function mapLoad(lat, lng, zm, ptlat, ptlng) {
	if (GBrowserIsCompatible()) {
		map = new GMap2(document.getElementById("map"));
		map.addControl(new GLargeMapControl());
		map.setCenter(new GLatLng(lat, lng), zm, G_NORMAL_MAP);
		setPoints(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();
	  }
	}
}

// Creates a marker whose info window displays the letter corresponding
// to the given index.
function createMarker(point, letter) {

  // Create a base icon for all of our markers that specifies the
  // shadow, icon dimensions, etc.
  var baseIcon = new GIcon(G_DEFAULT_ICON);
  baseIcon.shadow = "http://www.google.com/mapfiles/shadow50.png";
  baseIcon.iconSize = new GSize(20, 34);
  baseIcon.shadowSize = new GSize(37, 34);
  baseIcon.iconAnchor = new GPoint(9, 34);
  baseIcon.infoWindowAnchor = new GPoint(9, 2);

  // Create a lettered icon for this point using our icon class
  var letteredIcon = new GIcon(baseIcon);
  letteredIcon.image = "http://www.google.com/mapfiles/marker" + letter + ".png";

  // Set up our GMarkerOptions object
  markerOptions = { icon:letteredIcon };
  var marker = new GMarker(point, markerOptions);

  //GEvent.addListener(marker, "click", function() {
  //marker.openInfoWindowHtml("Marker <b>" + letter + "</b>");
  //});
  return marker;
}

addLoadEvent(premapLoad);
addUnLoadEvent(GUnload);