var bannerImg = new Array();
  // Enter the names of the images below
  bannerImg[0]="images_rotation/Yellow_starthistle_sm.jpg";
  bannerImg[1]="images_rotation/Artichoke_thistle_sm.jpg";
  bannerImg[2]="images_rotation/Biocontrol_on_yellow_starthistle_sm.jpg";
  bannerImg[3]="images_rotation/Black_nightshade_sm.jpg";
  bannerImg[4]="images_rotation/Common_groundsel_sm.jpg";
  bannerImg[5]="images_rotation/Dandelion_sm.jpg";
  bannerImg[6]="images_rotation/Gorse_sm.jpg";
  bannerImg[7]="images_rotation/Medusahead_sm.jpg";
  bannerImg[8]="images_rotation/Milk_thistle_sm.jpg";
  bannerImg[9]="images_rotation/Purple_starthistle_sm.jpg";
  bannerImg[10]="images_rotation/Ripgut_brome_sm.jpg";
  bannerImg[11]="images_rotation/Russian_thistle_sm.jpg";
  bannerImg[12]="images_rotation/Grindelia_camporum_sm.jpg";
  bannerImg[13]="images_rotation/Azolla_filiculoides2_sm.jpg";
  bannerImg[14]="images_rotation/calendula_arvensis2_sm.jpg";
  bannerImg[15]="images_rotation/Brassica_campestris_sm.jpg";
  bannerImg[16]="images_rotation/chondrilla_juncea3_sm.jpg";
  bannerImg[17]="images_rotation/carduus_nutans1_sm.jpg";

var newBanner = 0;
var totalBan = bannerImg.length;

function cycleBan() {
  newBanner++;
  if (newBanner == totalBan) {
    newBanner = 0;
  }
  document.banner.src=bannerImg[newBanner];
  // set the time below for length of image display
  // i.e., "4*1000" is 4 seconds
  setTimeout("cycleBan()", 6*1000);
}
window.onload=cycleBan;