var quote=new Array();
  quote[0]='<a href="taca.php"><img src="img/beneficios_taca.jpg" alt="" width="120" height="150" border="0" /></a>';
  quote[1]='<a href="promo_dotcoop.php"><img src="img/beneficios_dotcoop.jpg" alt="" width="120" height="150" border="0" /></a>';
  quote[2]='<a href="promo_dotcoop.php"><img src="img/beneficios_acidigital.jpg" alt="" width="120" height="150" border="0" /></a>';

var speed=7000;    /*this is the time in milliseconds adjust to suit*/
var q=0;

function showQuote() {

     document.getElementById("quotes").innerHTML=quote[q];
     q++;
if(q==quote.length) {
     q=0;
  }
}
setInterval('showQuote()',speed);