function getHTTPObject() {
    try{
        if (window.XMLHttpRequest)
            return new XMLHttpRequest();
        else if (window.ActiveXObject)
            return new ActiveXObject("Msxml2.XMLHTTP");
        else
            throw ("XMLHttpRequest not supported");
    }catch(e)
    {
        alert("Ajax.getHTTPObject(): "+e);
        return false;
    }
}
function is_ajax_error(xml_result,sender)
{
    if( xml_result.getElementsByTagName("error").length > 0 )
    {
            alert(xml_result.getElementsByTagName("error")[0].firstChild.nodeValue);
        	//window.location.href=_ERROR_PAGE_URL+
            //"?message="+xml_result.getElementsByTagName("error")[0].firstChild.nodeValue;
		
        return true;
    }
	
    return false;
	
}
function process_ajax_call(params,url,handler)
{
    try{
        var http_req=getHTTPObject();
        http_req.open("POST",url,true );
        http_req.setRequestHeader("Content-Type",
            "application/x-www-form-urlencoded; charset=UTF-8");
        http_req.onreadystatechange =function()
        {
            if(http_req.readyState == 4 )
            {
                if(http_req.status == 200)
                {
                    if( !is_ajax_error(http_req.responseXML,this) )
                        handler.call(http_req,false);
                    else
                        handler.call(http_req,true);
                }
                else
                    alert("Errore connesione AJAX: "+http_req.responseText);
            }
			
        }
        http_req.send(params);
    }catch(e)
    {
        alert("Ajax.process_ajax_call(): "+e);
        return false;
    }
}

function process_ajax_sync_call(params,url,handler)
{
    try{
        var http_req=getHTTPObject();
        http_req.open("POST",url,false );
        http_req.setRequestHeader("Content-Type",
            "application/x-www-form-urlencoded; charset=UTF-8");
        http_req.send(params);
        if(http_req.readyState == 4 )
        {
            if(http_req.status == 200)
            {

                //if( !is_ajax_error(http_req.responseXML,this) )
                    handler.call(http_req,false);
                //else
                    //handler.call(http_req,true);
            }
            else
                alert(http_req.responseText);
        }
        else
            alert(http_req.responseText);
		
    }catch(e)
    {
        alert("Ajax.process_ajax_call(): "+e);
        return false;
    }
}

function showPleaseWait(visible){
	document.getElementById('copertina').style.visibility=(visible?'visible':'hidden');
	document.getElementById("loading").style.display=(visible?'block':'none');
}

//Funzione per la creazione dinamica di un form si autosubmitta

function form_post_to_url(path, params, method) {
    method = method || "post"; // Set method to post by default, if not specified.

    // The rest of this code assumes you are not using a library.
    // It can be made less wordy if you use one.
    var form = document.createElement("form");
    form.setAttribute("method", method);
    form.setAttribute("action", path);

    for(var key in params) {
        var hiddenField = document.createElement("input");
        hiddenField.setAttribute("type", "hidden");
        hiddenField.setAttribute("name", key);
        hiddenField.setAttribute("value", params[key]);

        form.appendChild(hiddenField);
    }

    document.body.appendChild(form);    // Not entirely sure if this is necessary
    form.submit();
}

/*
 * Date Format 1.2.2
 * (c) 2007-2008 Steven Levithan <stevenlevithan.com>
 * MIT license
 * Includes enhancements by Scott Trenda <scott.trenda.net> and Kris Kowal <cixar.com/~kris.kowal/>
 * http://blog.stevenlevithan.com/archives/date-time-format
 * Accepts a date, a mask, or a date and a mask.
 * Returns a formatted version of the given date.
 * The date defaults to the current date/time.
 * The mask defaults to dateFormat.masks.default.
 */
var dateFormat = function () {
	var	token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
		timezoneClip = /[^-+\dA-Z]/g,
		pad = function (val, len) {
			val = String(val);
			len = len || 2;
			while (val.length < len) val = "0" + val;
			return val;
		};

	// Regexes and supporting functions are cached through closure
	return function (date, mask, utc) {
		var dF = dateFormat;

		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)
		if (arguments.length == 1 && (typeof date == "string" || date instanceof String) && !/\d/.test(date)) {
			mask = date;
			date = undefined;
		}

		// Passing date through Date applies Date.parse, if necessary
		date = date ? new Date(date) : new Date();
		if (isNaN(date)) throw new SyntaxError("invalid date");

		mask = String(dF.masks[mask] || mask || dF.masks["default"]);

		// Allow setting the utc argument via the mask
		if (mask.slice(0, 4) == "UTC:") {
			mask = mask.slice(4);
			utc = true;
		}

		var	_ = utc ? "getUTC" : "get",
			d = date[_ + "Date"](),
			D = date[_ + "Day"](),
			m = date[_ + "Month"](),
			y = date[_ + "FullYear"](),
			H = date[_ + "Hours"](),
			M = date[_ + "Minutes"](),
			s = date[_ + "Seconds"](),
			L = date[_ + "Milliseconds"](),
			o = utc ? 0 : date.getTimezoneOffset(),
			flags = {
				d:    d,
				dd:   pad(d),
				ddd:  dF.i18n.dayNames[D],
				dddd: dF.i18n.dayNames[D + 7],
				m:    m + 1,
				mm:   pad(m + 1),
				mmm:  dF.i18n.monthNames[m],
				mmmm: dF.i18n.monthNames[m + 12],
				yy:   String(y).slice(2),
				yyyy: y,
				h:    H % 12 || 12,
				hh:   pad(H % 12 || 12),
				H:    H,
				HH:   pad(H),
				M:    M,
				MM:   pad(M),
				s:    s,
				ss:   pad(s),
				l:    pad(L, 3),
				L:    pad(L > 99 ? Math.round(L / 10) : L),
				t:    H < 12 ? "a"  : "p",
				tt:   H < 12 ? "am" : "pm",
				T:    H < 12 ? "A"  : "P",
				TT:   H < 12 ? "AM" : "PM",
				Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
			};

		return mask.replace(token, function ($0) {
			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
		});
	};
}();

// Some common format strings
dateFormat.masks = {
	"default":      "ddd mmm dd yyyy HH:MM:ss",
	shortDate:      "m/d/yy",
	mediumDate:     "mmm d, yyyy",
	longDate:       "mmmm d, yyyy",
	fullDate:       "dddd, mmmm d, yyyy",
	shortTime:      "h:MM TT",
	mediumTime:     "h:MM:ss TT",
	longTime:       "h:MM:ss TT Z",
	isoDate:        "yyyy-mm-dd",
	isoTime:        "HH:MM:ss",
	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",
	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
	dayNames: [
		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
		"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
	],
	monthNames: [
		"Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
		"January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
	]
};

// For convenience...
Date.prototype.format = function (mask, utc) {
	return dateFormat(this, mask, utc);
};