function createXMLHTTP() {
	var ajax;
	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 zeracampo(el) {
  var elemento = el;
  for (i = elemento.options.length; i >= 0 ; i=i-1) {
	 elemento.options[i] = null;
  }
}



function InscrLocaisTrab(padrao) {

	if (frmInscricao.codCargo.value != 0) {
		zeracampo(frmInscricao.codLocTrab);
		frmInscricao.codLocTrab.options[0] = new Option('Aguarde...', '0');
               var req = createXMLHTTP();
               	req.open("post", "../paginas/ajax.php", true);
                req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;charset=iso-8859-1");
				req.setRequestHeader("encoding", "iso-8859-1"); 
                req.onreadystatechange=function(){
					if (req.readyState==4) { 
						document.all.div_codLocTrab.innerHTML = req.responseText;
					}
				}
                req.send("onde=codLocTrab&codConc=" + frmInscricao.codConc.value + "&codCargo=" + frmInscricao.codCargo.value+ "&codLocTrab=" + padrao);
   } else {
		zeracampo(frmInscricao.codLocTrab);
		frmInscricao.codLocTrab.options[0] = new Option('Escolha o cargo pretendido.', '0');
   }

}