var req;
function loadXMLDoc(url,valor){ req = null; if (window.XMLHttpRequest) { req = new XMLHttpRequest(); req.onreadystatechange = processReqChange; req.open("GET", url+'?estado='+valor, true); req.send(null);} else if (window.ActiveXObject) { req = new ActiveXObject("Microsoft.XMLHTTP"); if (req) { req.onreadystatechange = processReqChange; req.open("GET", url+'?estado='+valor, true); req.send();}}}
function processReqChange(){if(req.readyState == 4){if (req.status == 200) {document.getElementById('cidades').innerHTML = req.responseText;
} else { alert("Houve um problema ao obter os dados:\n" + req.statusText);}}}
function Atualiza(valor){
	if(valor == 'nenhum'){
		document.getElementById('cidades').innerHTML = '';
	}else{
		loadXMLDoc("classes/cidades.php",valor);
	}
}
function loading(){document.getElementById('cidades').innerHTML = "<img src='imagens/lendo.gif' width='10' height='10'> lendo informações...";}