// declare new variables for each new div that you add, and link to the div by ID
// var region_div = document.getElementById("region_div");
var doc = null;

function ajax() {
	// Make a new XMLHttp object
	if (typeof window.ActiveXObject != 'undefined' ) doc = new ActiveXObject("Microsoft.XMLHTTP");
	else doc = new XMLHttpRequest();
}

function seleccionaregiao(pagina,id_pais, area){
    if (id_pais != '') {
		ajax();
	    if (doc){
	    	var region_div_id;
	    	if(area)
	    		region_div_id=area.id;
	       area.innerHTML = "carregando dados...";
	       doc.open("GET", "regioes.asp?id=" + id_pais + "&p=" + pagina, false);
	       doc.send(null);
	       area.innerHTML = doc.responseText;
	    }
	    else{
	       area.innerHTML = 'Sem suporte do browser para objecto XMLHttp';
	    }
    }
    else {
    	area.innerHTML = "O país não seleccionado";
    }
}