// JavaScript Document
function createXMLHTTP() {
	try {
		ajax = new ActiveXObject("Microsoft.XMLHTTP");
	} catch(e) {
		try	{
			ajax = new ActiveXObject("Msxml2.XMLHTTP");
			alert(ajax);
		} catch(ex) {
			try {
				ajax = new XMLHttpRequest();
			} catch(exc) {
				alert("Esse browser não tem recursos para uso do Ajax");
				ajax = null;
			}
		}
		return ajax;
	}
	var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",
						 "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
						 "Microsoft.XMLHTTP"];
	for (var i=0; i < arrSignatures.length; i++) {
		try { 
			var oRequest = new ActiveXObject(arrSignatures[i]);
			return oRequest;
		} catch (oError) {}
	}
	throw new Error("MSXML is not installed on your system.");
} 
	
function goAjax(url, metodo, modo, tagRetorno, parametros) {
     document.getElementById(tagRetorno).innerHTML='<div align="center" class="carregando"><img src="imagens/layout/carregando.gif"></div>'
	var xmlhttp = createXMLHTTP();
	if(metodo == "GET") {
		xmlhttp.open("GET", url, modo);
	} else {        
		xmlhttp.open("POST", url, modo);
		xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=iso-8859-1");
		xmlhttp.setRequestHeader("Cache-Control", "no-store, no-cache, must-revalidate");
//		xmlhttp.setRequestHeader("Cache-Control", "post-check=0, pre-check=0");
		xmlhttp.setRequestHeader("Pragma", "no-cache");
	}    
	
	xmlhttp.onreadystatechange = function() {
		if(xmlhttp.readyState == 4) {
			retorno=xmlhttp.responseText
			document.getElementById(tagRetorno).innerHTML=retorno
			//findScript(retorno)
		}
	}

	xmlhttp.send(parametros);

}