function url(url) {
                function createXMLHttpRequest()
                {
                        try{ return new ActiveXObject("Msxml2.XMLHTTP"); }catch(e){}
                        try{ return new ActiveXObject("Microsoft.XMLHTTP"); }catch(e){}
                        try{ return new XMLHttpRequest(); }catch(e){}
                        alert("XMLHttpRequest not supported");
                        return null;
                }
                var xhReq = createXMLHttpRequest();
                xhReq.open("post",url,true);
                xhReq.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
                xhReq.onreadystatechange = function do_readyStateChange(to) {
                        if (xhReq.readyState == 4)
                        {
                                document.getElementById("conteudo").innerHTML = xhReq.responseText;
                                window.location = '#conteudo';
                        }
                        else
                        {
                                document.getElementById("conteudo").innerHTML = '<p style="text-align: center; padding-top: 50px;"><img src="imagens/loader.gif"><br /><br />Carregando...</p>';
                        }
                }
                xhReq.send("&a=1");
}