function Banners()
{
    var MNews = new Array(); 
    MNews[0]= '<A HREF="#"><IMG SRC="imagens/topo151.jpg"  WIDTH=725 HEIGHT=123 BORDER=0 ALT=""></a>'
    MNews[1]= '<A HREF="#"><IMG SRC="imagens/topo152.jpg"  WIDTH=725 HEIGHT=123 BORDER=0 ALT=""></a>'
    MNews[2]= '<A HREF="#"><IMG SRC="imagens/topo153.jpg"  WIDTH=725 HEIGHT=123 BORDER=0 ALT=""></a>'
      
   var Numero = Math.floor(Math.random()*3);
   document.write(MNews[Numero]);
}