var http_request = false;
var div_metti = '';
var func_mia = '';

function makePOSTRequest(url, parametri, div_mio, func_mia) {
	http_request = false;
	div_metti = div_mio;
	func_metti = func_mia;
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			//Inserisco anticipatamente  il Content Type
			//http_request.overrideMimeType('text/xml');
			http_request.overrideMimeType('text/html');
			}
		} else if (window.ActiveXObject) { // IE
			try {
				http_request = new ActiveXObject("Msxml2.XMLHTTP");
				} catch (e) {
					try {
						http_request = new ActiveXObject("Microsoft.XMLHTTP");
						} catch (e) {}
					}
		}
	if (!http_request) {
		alert('Non posso creare l\'istanza XMLHTTP');
		return false;
		}
      
	http_request.onreadystatechange = alertContents;
	http_request.open('POST', url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", parametri.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(parametri);
	}

function alertContents() {
	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			//alert(http_request.responseText);
			result = http_request.responseText;
			document.getElementById(div_metti).innerHTML = result;
			if (func_mia != "nessuna") {
				}		 
			}
		}
	}