function abrirPag(valor,div,str){
    var url = valor;
    var xmlRequest = GetXMLHttp();
    xmlRequest.open("GET", url, true);
    xmlRequest.onreadystatechange = mudancaEstado;
    xmlRequest.send(null);
    if (xmlRequest.readyState == 1) {
        document.getElementById(div).innerHTML = "<center><img src='imagens/site/load_aba.gif'><br/>"+str+"</center>";
        return url;
    }
    function mudancaEstado(){
        //        var divstr=div+"";
        if (xmlRequest.readyState == 4){
            document.getElementById(div).innerHTML = xmlRequest.responseText;
        }
    }
}