function prendiElementoDaId(id_elemento)
{
	var elemento;
	if(document.getElementById)
		elemento = document.getElementById(id_elemento);
	else
		elemento = document.all[id_elemento];
	return elemento;
};

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;
};

function caricaTesto(id,nomeFile,params)
{
	var
	ajax = assegnaXMLHttpRequest(),
	elemento = prendiElementoDaId(id),
	usaLink = true;

	if(ajax)
	{
		usaLink = false;
		ajax.open("post", nomeFile, true);
		ajax.setRequestHeader("connection", "close");

		ajax.setRequestHeader("content-type", "application/x-www-form-urlencoded");
					
		ajax.onreadystatechange = function()
		{
			if(ajax.readyState === readyState.COMPLETATO)
			{
				if(statusText[ajax.status] === "OK")
				{
					elemento.innerHTML = ajax.responseText;
				}
				else
				{
					elemento.innerHTML = "Impossibile effettuare l'operazione richiesta.<br />";
					elemento.innerHTML += "Errore riscontrato: " + statusText[ajax.status];
				}
			} 
		}
		ajax.send(params);
  	}
	return usaLink;
};

var readyState = {
	INATTIVO:	0,
	INIZIALIZZATO:	1,
	RICHIESTA:	2,
	RISPOSTA:	3,
	COMPLETATO:	4
};

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";