var bannerImg = new Array();
  // Enter the names of the images below
  bannerImg[0]="http://www.waderstudygroup.org/images/banner01.jpg";
  bannerImg[1]="http://www.waderstudygroup.org/images/banner02.jpg";
  bannerImg[2]="http://www.waderstudygroup.org/images/banner03.jpg";
  bannerImg[3]="http://www.waderstudygroup.org/images/banner04.jpg";
  bannerImg[4]="http://www.waderstudygroup.org/images/banner05.jpg";
  bannerImg[5]="http://www.waderstudygroup.org/images/banner06.jpg";
  bannerImg[6]="http://www.waderstudygroup.org/images/banner07.jpg";
  bannerImg[7]="http://www.waderstudygroup.org/images/banner08.jpg";

var newBanner = 0;  
 
function cycleBan() {
  var newBanner= Math.floor(Math.random()*8);
    
  document.banner.src=bannerImg[newBanner];
  // set the time below for length of image display
  // i.e., "4*1000" is 4 seconds
  setTimeout("cycleBan()", 15*1000);
}
window.onload=cycleBan;