<!-- Begin
var how_many_ads = 4;
var now = new Date()
var sec = now.getSeconds()
var ad = sec % how_many_ads;
ad +=1;
if (ad==1) {
txt=""; 
url="http://www.dohms.com.br";
alt="Dohms Comunicação";
banner="http://www.cienciaefe.org.br/imagens/banners/Dohms.gif";
width="468";
height="60";
}

if (ad==2) {
txt="";
url="#1";
alt="Ghost Writer";
banner="http://www.cienciaefe.org.br/imagens/banners/ghost_writer.gif";
width="468";
height="60";
}
if (ad==3) {
txt="";
url="#1";
alt="Agostinho Baldin";
banner="http://www.cienciaefe.org.br/imagens/banners/agostinho_baldin.gif";
width="468";
height="60";
}
if (ad==4) {
txt=""; 
url="http://www.radiobandab.com.br";
alt="AM 550 - Rádio Banda B";
banner="http://www.cienciaefe.org.br/imagens/banners/bandab.gif";
width="468";
height="60";
}
document.write('<center>');
//document.write('<a href=\"' + url + '\" target=\"_blank\">');
document.write('<a href=\"' + url + '\"> ');
document.write('<img src=\"' + banner + '\" width=')
document.write(width + ' height=' + height + ' ');
document.write('alt=\"' + alt + '\" border=0><br>');
document.write('<small>' + txt + '</small></a>');
document.write('</center>');
// End -->
