var bannerImg = new Array();
  // Enter the names of the images below
 bannerImg[0]="http://www.acupuncture.com/images/banner1.jpg";
 bannerImg[1]="http://www.acupuncture.com/images/banner2.jpg"; 
 bannerImg[2]="http://www.acupuncture.com/images/banner3.jpg";
 bannerImg[3]="http://www.acupuncture.com/images/banner4.jpg";
 bannerImg[3]="http://www.acupuncture.com/images/banner5.jpg";
 
var newBanner = 0;
var totalBan = bannerImg.length;

function cycleBan() {
  newBanner++;
  if (newBanner == totalBan) {
    newBanner = 0;
  }
  document.getElementById("rotatingBg").background = bannerImg[newBanner];
  // set the time below for length of image display
  // i.e., "4*1000" is 4 seconds
  setTimeout("cycleBan()", 30*1000);
}
window.onload=cycleBan;