function processa_resposta(httpRequest,funcao) {
    if (httpRequest.readyState == 4) {
        if (httpRequest.status == 200) {
            eval(funcao+'(httpRequest);');
        }
    }
}


function makeRequest(url, metodo, dados, exe) {
    var httpRequest;
    if (window.XMLHttpRequest) { // Mozilla, Safari, ...
        httpRequest = new XMLHttpRequest();
    } else if (window.ActiveXObject) { // IE
        try {
            httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e) {
            try {
                httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
            }
        	catch (e) {}
        }
    }

    if (!httpRequest) {
        alert('Erro httpRequest: Componente não disponível!');
        return false;
    }

	httpRequest.open(metodo, url, true);
    httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    httpRequest.onreadystatechange = function (){ processa_resposta(httpRequest, exe ); } ;
    httpRequest.send(dados);
}