function xmlhttpPost(strURL,formname,responsediv,responsemsg) {
		var xmlHttpReq = false;
		var self = this;
		// Xhr per Mozilla/Safari/Ie7
		if (window.XMLHttpRequest) {
		self.xmlHttpReq = new XMLHttpRequest();
		}
		// per tutte le altre versioni di IE
		else if (window.ActiveXObject) {
		self.xmlHttpReq = new ActiveXObject("Microsoft.XMLHTTP");
		}
		self.xmlHttpReq.open('POST', strURL, true);
		self.xmlHttpReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
		self.xmlHttpReq.onreadystatechange = function() {
		if (self.xmlHttpReq.readyState == 4) {
		// Quando pronta, visualizzo la risposta del form
		updatepage(self.xmlHttpReq.responseText,responsediv);
		}
		else{
		// In attesa della risposta del form visualizzo il msg di attesa
		updatepage(responsemsg,responsediv);
		}
		}
		self.xmlHttpReq.send(getquerystring(formname));
		}
		function getquerystring(formname) {
		var form = document.forms[formname];
		var qstr = "";
		function GetElemValue(name, value) {
		qstr += (qstr.length > 0 ? "&" : "")
		+ escape(name).replace(/\+/g, "%2B") + "="
		+ escape(value ? value : "").replace(/\+/g, "%2B");
		//+ escape(value ? value : "").replace(/\n/g, "%0D");
		}
		var elemArray = form.elements;
		for (var i = 0; i < elemArray.length; i++) {

        var element = elemArray[i];

        var elemType = element.type.toUpperCase();

        var elemName = element.name;

        if (elemName) {

            if (elemType == "TEXT"

                    || elemType == "TEXTAREA"

                    || elemType == "PASSWORD"

					|| elemType == "BUTTON"

					|| elemType == "RESET"

					|| elemType == "SUBMIT"

					|| elemType == "FILE"

					|| elemType == "IMAGE"

                    || elemType == "HIDDEN")

                GetElemValue(elemName, element.value);

            else if (elemType == "CHECKBOX" && element.checked)

                GetElemValue(elemName, 

                    element.value ? element.value : "On");

            else if (elemType == "RADIO" && element.checked)

                GetElemValue(elemName, element.value);

            else if (elemType.indexOf("SELECT") != -1)

                for (var j = 0; j < element.options.length; j++) {

                    var option = element.options[j];

                    if (option.selected)

                        GetElemValue(elemName,

                            option.value ? option.value : option.text);

                }

        }

    }

    return qstr;

}

function updatepage(str,responsediv){

    document.getElementById(responsediv).innerHTML = str;

}