if (document.images) {
  imageAon = new Image();
  imageAon.src = "../indeximages/donateON.gif";

  imageAoff = new Image();
  imageAoff.src = "../indeximages/donate.gif";

  imageBon = new Image();
  imageBon.src = "../indeximages/volunteerON.gif";
  
  imageBoff = new Image();
  imageBoff.src = "../indeximages/volunteer.gif";


}


function changeImages() {
  if (document.images) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    }
  }
}