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();
}
function carregaCidade() 
{
   	var indice = document.getElementById("Estado").selectedIndex;
	var tipo = document.getElementById("Estado").options[indice].value;
	if(tipo == "")
	{
		
	}
	else
	{
		var url = "procura_cidade.php?uf="+document.getElementById("Estado").options[indice].value+"";
	}
	
var divInfo = document.getElementById("carregaCidade");
var XMLHttp = criaXMLHttp();
XMLHttp.open("get", url, true);
divInfo.innerHTML = "";
divInfo.innerHTML = carregando();
XMLHttp.onreadystatechange = function () 
{
	if (XMLHttp.readyState == 4)
		if (XMLHttp.status == 200)
		{
			divInfo.innerHTML = XMLHttp.responseText;
		} 
		else 
		{
			divInfo.innerHTML = "<select name='Cidade' id='filtro4'><option value=''>Cidade</option></select>";
		}
};
XMLHttp.send(null);

}

function carregando()
{
        var msg = "<span>Carregando cidades...</span>";
        return msg;
}