function makePOSTRequest(url,parameters,id_div_output,notify_waiting,functRet) {
        var http_request = false;
        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
                // See note below about this line
            }
        } 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('Giving up :( Cannot create an XMLHTTP instance');
            return false;
        }
		if(notify_waiting){
			document.getElementById(id_div_output).innerHTML='<div style="margin:0 auto;width:20px;padding:20px;text-align:center"><img src="img/loading.gif" /></div>';
		}
		http_request.open("POST", url, true);
		http_request.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        http_request.onreadystatechange = function() { alertContents(http_request,id_div_output,functRet); };
		http_request.send(parameters);

    }

    function alertContents(http_request,output,funzione) {

        if (http_request.readyState == 4) {
		//Stato OK
		if (http_request.status == 200) {
			var resp = http_request.responseText;	
			var cont = document.getElementById(output);
			
			cont.innerHTML = resp;	
			if(funzione!="")
			{
				eval(funzione);
			}
		}
		waiting = false;
		
	
        }

    }