function showQuote() {

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

var quote=new Array();
  quote[0]='An endowment ensures the Foundation’s ability to be prepared to fund more projects. Unrestricted gifts to our endowment ensure a legacy of learning for the dairy community.';

var speed=10000;    /*this is the time in milliseconds adjust to suit*/
var q=0;

setInterval('showQuote()',speed);