function createObject() {
var tipo_richiesta;
var browser = navigator.appName;
if(browser == "Microsoft Internet Explorer"){
tipo_richiesta = new ActiveXObject("Microsoft.XMLHTTP");
}else{
tipo_richiesta = new XMLHttpRequest();
}
	return tipo_richiesta;
}

var http = createObject();

function verifica(valore) {
	// add image progress
	var par = window.parent.document;
	var images = par.getElementById('dati');
	var new_div = par.createElement('div');
	var new_img = par.createElement('img');
	new_img.src = 'indicator.gif';
	new_div.appendChild(new_img);
	images.appendChild(new_div);
	http.open('get', 'verifica.php?valore='+valore);
	http.onreadystatechange = handleResponse;
	http.send(null);
}

function handleResponse() {
	if(http.readyState == 4){
		var response = http.responseText;
		document.getElementById('dati').innerHTML = response;
	}
}