request=createRequest();

function loadContador(){
	request.open('get', '/contador.php');
	request.onreadystatechange=function(){
		var estado=request.readyState;
		var nodo=document.getElementById('contador');
		if(estado==2){
			nodo.innerHTML="<h3>Cargando contador</h3>\n";
		} else if(estado==4){
			nodo.innerHTML=request.responseText;
		}
	}
	request.send('');
}

function createRequest(){
	var request;
	var success=false;
	if(window.XMLHttpRequest){
		try{
			request=new XMLHttpRequest();
			success=true;
		} catch (e){
			try{
				request=new ActiveXObject("Microsoft.XMLHTTP");
				success=true;
			} catch(e){
				alert('AJAX no soportado');
			}
		}
	}
	if(success) return request
	return false;
}