var http_request = false;

            function makeRequest(url) {

                http_request = false;

                if (window.XMLHttpRequest) { // Mozilla, Safari,...
                    http_request = new XMLHttpRequest();
                    if (http_request.overrideMimeType) {
                        http_request.overrideMimeType('text/xml');
                    }
                } else if (window.ActiveXObject) { // IE
                    try {
                        http_request = new ActiveXObject("Msxml2.XMLHTTP");
                    } catch (e) {
                        try {
                        http_request = new ActiveXObject("Microsoft.XMLHTTP");
                        } catch (e) {}
                    }
                }

                if (!http_request) {
                    alert('Giving up :( Cannot create an XMLHTTP instance');
                    return false;
                }
                http_request.onreadystatechange = changeBody;
                http_request.open('GET', url, true);
                http_request.send(null);

            }

            function changeBody() {

                if (http_request.readyState == 4) {
                    if (http_request.status == 200) {
                        var x=document.getElementById("principal");
  			            x.innerHTML = http_request.responseText;
                    } else {
                        alert('Ocorreu um problema interno no site.\nPor favor informe a aramis.negreiros@tecnoworld.com.br');
                    }
                }

            }