function createMarker(point,html) {
var marker = new GMarker(point);
GEvent.addListener(marker, "click", function() {
  marker.openInfoWindowHtml(html);
});
return marker;
}

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();
	  }
	}
}	

function createRequest() {  
  // create an Ajax Request  
  var ajaxRequest; 
  try
  {
    ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
  }    
    catch (e1)
    {
      try
      {
        ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
      }
        catch (e2)
        {
          ajaxRequest = new XMLHttpRequest();
        }
    }
  return ajaxRequest;
}

addLoadEvent(createMap);
addUnLoadEvent(GUnload);