/** (C) HTML.IT - insieme di funzioni ed oggetti utili per interagire con ajax */

/** FUNZIONI */

	// funzione per prendere un elemento con id univoco
		function prendiElementoDaId(id_elemento) {
			var elemento;
			if(document.getElementById)
				elemento = document.getElementById(id_elemento);
			else
				elemento = document.all[id_elemento];
			return elemento;
		}
	
	// funzione per assegnare un oggetto XMLHttpRequest
		function assegnaXMLHttpRequest() {
			var
				XHR = null,
				browserUtente = navigator.userAgent.toUpperCase();
			if(typeof(XMLHttpRequest) === "function" || typeof(XMLHttpRequest) === "object")
				XHR = new XMLHttpRequest();
			else if(window.ActiveXObject && browserUtente.indexOf("MSIE 4") < 0) {
				if(browserUtente.indexOf("MSIE 5") < 0)
					XHR = new ActiveXObject("Msxml2.XMLHTTP");
				else
					XHR = new ActiveXObject("Microsoft.XMLHTTP");
			}
			return XHR;
		}



/** OGGETTI / ARRAY */

	// oggetto di verifica stato
		var readyState = {
			INATTIVO:	0,
			INIZIALIZZATO:	1,
			RICHIESTA:	2,
			RISPOSTA:	3,
			COMPLETATO:	4
		};

	// array descrittivo dei codici restituiti dal server
	// [la scelta dell' array è per evitare problemi con vecchi browsers]
		var statusText = new Array();
		statusText[100] = "Continue";
		statusText[101] = "Switching Protocols";
		statusText[200] = "OK";
		statusText[201] = "Created";
		statusText[202] = "Accepted";
		statusText[203] = "Non-Authoritative Information";
		statusText[204] = "No Content";
		statusText[205] = "Reset Content";
		statusText[206] = "Partial Content";
		statusText[300] = "Multiple Choices";
		statusText[301] = "Moved Permanently";
		statusText[302] = "Found";
		statusText[303] = "See Other";
		statusText[304] = "Not Modified";
		statusText[305] = "Use Proxy";
		statusText[306] = "(unused, but reserved)";
		statusText[307] = "Temporary Redirect";
		statusText[400] = "Bad Request";
		statusText[401] = "Unauthorized";
		statusText[402] = "Payment Required";
		statusText[403] = "Forbidden";
		statusText[404] = "Not Found";
		statusText[405] = "Method Not Allowed";
		statusText[406] = "Not Acceptable";
		statusText[407] = "Proxy Authentication Required";
		statusText[408] = "Request Timeout";
		statusText[409] = "Conflict";
		statusText[410] = "Gone";
		statusText[411] = "Length Required";
		statusText[412] = "Precondition Failed";
		statusText[413] = "Request Entity Too Large";
		statusText[414] = "Request-URI Too Long";
		statusText[415] = "Unsupported Media Type";
		statusText[416] = "Requested Range Not Satisfiable";
		statusText[417] = "Expectation Failed";
		statusText[500] = "Internal Server Error";
		statusText[501] = "Not Implemented";
		statusText[502] = "Bad Gateway";
		statusText[503] = "Service Unavailable";
		statusText[504] = "Gateway Timeout";
		statusText[505] = "HTTP Version Not Supported";
		statusText[509] = "Bandwidth Limit Exceeded";







/** ABC - Ajax Basic Call
 * @author  Andrea Giammarchi
 * @site        www.devpro.it */
ABC = (function(ABC){
    return  function(data, url, async, user, pass){
        var time    = new Date,
            abc     = ABC(),
            send    = [],
            key     = null;
        if(data){
            for(key in data)
                if(typeof data[key] !== "function" && data.hasOwnProperty(key)){
                    if(data[key] instanceof Array)
                        for(var i = 0; i < data[key].length; i++)
                            send.push(encodeURIComponent(key).concat("=", encodeURIComponent(data[key][i])));
                    else
                        send.push(encodeURIComponent(key).concat("=", encodeURIComponent(data[key])));
                }
            key = 0 < send.length ? send.join("&") : null;
        };
        abc.open(
            key !== null ? "POST" : "GET",
            url,
            async = async === undefined ? true : !!async,
            user !== undefined && user,
            pass !== undefined && pass
        );
        abc.setRequestHeader("If-Modified-Since", "Mon, 26 Jul 1997 05:00:00 GMT");
        abc.setRequestHeader("Cache-Control", "no-cache");
        abc.setRequestHeader("X-Requested-With", "XMLHttpRequest");
        if(key !== null)
            abc.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        if(async)
            abc.onreadystatechange= function(){
                if(abc.readyState === 4 && data){
                    key = /^(2|3)[0-9]{2}$/.test(abc.status) ? "onLoad" : "onError";
                    if(typeof data[key] === "function")
                        data[key](abc, new Date - time);
                }
            };
        abc.send(key);
        return  abc;
    };
})(this.XMLHttpRequest ?
    function(){return new XMLHttpRequest;} :
    function(){return new ActiveXObject("Microsoft.XMLHTTP");}
);