try{
    xmlhttp = new XMLHttpRequest();
}catch(ee){
    try{
        xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    }catch(e){
        try{
            xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
        }catch(E){
            xmlhttp = false;
        }
    }
}

atual=0
function carrega(n){
    //var conteudo=document.getElementById("conteudo")
    //conteudo.innerHTML='<div class="carregando">carregando...</div>'
    atual=n
    xmlhttp.open("GET", "funcoes.php?n="+n+"&"+Math.random(),true);
    xmlhttp.onreadystatechange=function() {
        if (xmlhttp.readyState==4){
            var texto=xmlhttp.responseText
            texto=texto.replace(/\+/g," ")
            texto=unescape(texto)
            var conteudo=document.getElementById("conteudo")
            conteudo.innerHTML=texto
            var menu=document.getElementById("topo")
           var links=menu.getElementsByTagName("a")
            //for(var i=0;i<links.length;i++)
            //    links[i].className=""
            links[atual-1].className="selected"
        }
    }
    xmlhttp.send(null)
}

function menuclick(e){
    if(typeof(e)=='undefined')var e=window.event
    source=e.target?e.target:e.srcElement
    if(source.nodeType==3)source=source.parentNode
    n=source.getAttribute("href").replace(/.*=/,"")
    carrega(parseInt(n))
    return false
}

function init(){
    var menu=document.getElementById("topo")
    var links=menu.getElementsByTagName("a")
    for(var i=0;i<links.length;i++)
        links[i].onclick=menuclick
}

if(xmlhttp)window.onload=init