function assegnaXMLHttpRequest() {
	var xmlHttp;
	try {
	// Firefox, Opera 8.0+, Safari, IE7
		xmlHttp=new XMLHttpRequest();
	}
	catch (e) {
	// Internet Explorer 5.x 6
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e) {
			try {
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e) {
				alert("Il tuo browser non supporta AJAX!");
				return false;
			}
		}
	}
	return xmlHttp;
}

function ajaxFunction(editTag,paginaHtml) {
	var ajax= assegnaXMLHttpRequest();
	var e = document.getElementById(editTag);
	ajax.onreadystatechange= function() {
		if(ajax.readyState==4) {
    		e.innerHTML= ajax.responseText;
		}
	}
	ajax.open("GET",paginaHtml,true);
	ajax.send(null);
}