var imgs1 = new Array("resources/img_1.gif","resources/img_2.gif");
var alt1 = new Array("garden fountains and water features","garden fountains and water features");
var currentAd1 = 0;
var imgCt1 = 2;
function cycle1() {
  if (currentAd1 == imgCt1) {
    currentAd1 = 0;
  }
var banner1 = document.getElementById('adBanner1');

  banner1.src=imgs1[currentAd1]
  banner1.alt=alt1[currentAd1]

  currentAd1++;
}
  window.setInterval("cycle1()",2000);