/**
 * @author francesco
 */
function specialChars(str)
{
	var stringa = new String(str);

	stringa = stringa.replace(/&/g, "[EC]");
	stringa = stringa.replace(/:/g, "[DP]");
	stringa = stringa.replace(/\+/g, "[P]");
	stringa = stringa.replace(/\*/g, "[AS]");
	stringa = stringa.replace(/%/g, "[MD]");

	return stringa;
}

function createXMLHttpRequest()
{
	var xmlhttp = false;

	try
	{ xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); }
	catch (oldIE)
	{
		try
		{ xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); }
		catch (notIE)
		{ xmlhttp = false; }
	}

	if (!xmlhttp && typeof XMLHttpRequest != undefined)
	{ xmlhttp = new XMLHttpRequest(); }

	return xmlhttp;
}

function makeRequest(sPage, fTarget, sMethod, str)
{
	xmlhttp = createXMLHttpRequest();

	if (sMethod == "GET")
	{
		xmlhttp.open(sMethod, sPage);
		xmlhttp.onreadystatechange = function()
		{ fTarget(xmlhttp); }

		xmlhttp.send(null);
	}
	else if (sMethod == "POST")
	{
		xmlhttp.open(sMethod, sPage, true);
		xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
		xmlhttp.onreadystatechange = function()
		{ fTarget(xmlhttp); }

		xmlhttp.send(str);
	}
	else
	{ throw new Error("Metodo per scambio dati non riconosciuto."); }
}