var quote=new Array();
  quote[0]='A niche agency specialising in Commercial Leasing, Sales and Property Management';    /* add as many quotes as you like!*/

var speed=5000;    /*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);