//##################################################################################
//## FORM SUBMIT WITH AJAX                                                        ##
//## @Author: Simone Rodriguez aka Pukos <http://www.SimoneRodriguez.com>         ##
//## @Version: 1.2                                                                ##
//## @Released: 28/08/2007                                                        ##
//## @License: GNU/GPL v. 2 <http://www.gnu.org/copyleft/gpl.html>                ##
//##################################################################################


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;
}