function criaXMLHttp() {
	 if (typeof XMLHttpRequest != "undefined")
	 	return new XMLHttpRequest();
	 else if (window.ActiveXObject){
	 	var versoes = ["MSXML2.XMLHttp.5.0",
	 	"MSXML2.XMLHttp.4.0", "MSXML2.XMLHttp.3.0",
	 	"MSXML2.XMLHttp", "Microsoft.XMLHttp"
	 	];
	 }
	 for (var i = 0; i < versoes.length; i++){
	 	try{
	 		return new ActiveXObject(versoes[i]);
	 	}catch (e) {}
	 }
	 throw new Error("Seu browser nao suporta AJAX");
}
function loadCidades(link) {
	var id = document.getElementById("estado").value;
	var divCidade = document.getElementById("divCidade");
	var XMLHttp = criaXMLHttp();
	XMLHttp.open("get", link+".php?id=" + id, true);
	XMLHttp.onreadystatechange = function () {
		if (XMLHttp.readyState == 4)
			if (XMLHttp.status == 200){
				divCidade.innerHTML = XMLHttp.responseText;
			} else {
				divCidade.innerHTML = "Um erro ocorreu" + XMLHttp.statusText;
			}
	};
	XMLHttp.send(null);
}