if (document.images) {
  nav_intro_on = newImage("Winter2008/images/nav_intro_on.jpg")
  nav_intro_off = newImage("Winter2008/images/nav_intro_off.jpg")
  nav_master_on = newImage("Winter2008/images/nav_master_on.jpg")
  nav_master_off = newImage("Winter2008/images/nav_master_off.jpg")
  nav_focus_on = newImage("Winter2008/images/nav_focus_on.jpg")
  nav_focus_off = newImage("Winter2008/images/nav_focus_off.jpg")
  nav_case_on = newImage("Winter2008/images/nav_case_on.jpg")
  nav_case_off = newImage("Winter2008/images/nav_case_off.jpg")
  nav_home_on = newImage("Winter2008/images/nav_home_on.jpg")
  nav_home_off = newImage("Winter2008/images/nav_home_off.jpg")
}
function newImage(img) {
  if (document.images) {
    newimg = new Image();
    newimg.src = img;
    return newimg;
  }
}
function imageOn(img) {
  if (document.images) {
    document[img].src = eval(img + "_on.src");
  }
}
function imageOff(img) {
  if (document.images) {
    document[img].src = eval(img + "_off.src");
  }
}
function toolDigg(url) {
  var diggurl = "http://digg.com/submit?phase=2&url=" + url + "&title=" + enctitle + "&bodytext=" + encdesc + "&topic=health";
  showPopUp(diggurl);
  return false;
}
function toolDelicious(url) {
  var deliciousurl = "http://del.icio.us/post?v=4&noui&jump=close&url=" + url + "&title=" + enctitle + "&notes=" + encdesc;
  showPopUp(deliciousurl);
  return false;
}
function showPopUp(url) {
  var options = "width=950,height=600,status=0,toolbar=0,location=0,menubar=0,scrollbars=yes,resizable=yes";
  window.open(url, "_blank", options);
  return false;
}