var mapInUse=false;
function load(){
 if(document.getElementById("map_canvas")) {
  mapInUse=true;
  initMap();
 }
}
function unload(){
 if(mapInUse){
  GUnload();
 }
}
function initMap(){
 if (GBrowserIsCompatible()){ 
  var map = new GMap2(document.getElementById("map_canvas"));
  map.addControl(new GLargeMapControl());
  map.setCenter(new GLatLng(givenLat, givenLon), givenZoom);
 }
}
function createBookmark() {
 var title = document.title;  
 var url = location.href; 
 if (window.sidebar) { // Mozilla Firefox Bookmark  
  window.sidebar.addPanel(title, url,"");
 } else if(window.external) { // IE Favorite
  window.external.AddFavorite(url, title); 
 } else if(window.opera && window.print) { // Opera Hotlist
  return true; 
 }
}