var how_many_ads = 10;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;



if (ad==1) {
url="c_previsao2.shtml";
alt="";
banner="ran/v07.gif";
width="138";
height="140";
}

if (ad==2) {
url="oficinas_florais.shtml";
alt="";
banner="ran/v39.gif";
width="138";
height="140";
}

if (ad==3) {
url="cursos.shtml";
alt="";
banner="ran/v43.gif";
width="138";
height="140";
}

if (ad==4) {
url="oficinas_urano.shtml";
alt="";
banner="ran/v51.gif";
width="138";
height="140";
}

if (ad==5) {
url="cursos.shtml";
alt="";
banner="ran/v44.gif";
width="138";
height="140";
}

if (ad==6) {
url="oficinas_saturno.shtml";
alt="";
banner="ran/v48.gif";
width="138";
height="140";
}

if (ad==7) {
url="oficinas_curtoscircuitos.shtml";
alt="";
banner="ran/v52.gif";
width="138";
height="140";
}

if (ad==8) {
url="c_psicologia2.shtml";
alt="";
banner="ran/vpsico2.gif";
width="138";
height="140";
}

if (ad==9) {
url="c_pprv.shtml";
alt="";
banner="ran/vpprv.gif";
width="138";
height="140";
}
if (ad==10) {
url="c_admkt.shtml";
alt="";
banner="ran/vadmkt.gif";
width="138";
height="140";
}