if (document.images) {
  about_bg_on = new Image();
  about_bg_off = new Image();
  about_bg_on.src = "/common/images/nav/pn_about_on_210x31.gif";
  about_bg_off.src = "/common/images/nav/pn_about_off_210x31.gif";

  help_bg_on = new Image();
  help_bg_off = new Image();
  help_bg_on.src = "/common/images/nav/pn_help_on_112x31.gif";
  help_bg_off.src = "/common/images/nav/pn_help_off_112x31.gif";

  successStories_bg_on = new Image();
  successStories_bg_off = new Image();
  successStories_bg_on.src = "/common/images/nav/pn_successStories_on_118x31.gif";
  successStories_bg_off.src = "/common/images/nav/pn_successStories_off_118x31.gif";

  tips_bg_on = new Image();
  tips_bg_off = new Image();
  tips_bg_on.src = "/common/images/nav/pn_tips_on_115x31.gif";
  tips_bg_off.src = "/common/images/nav/pn_tips_off_115x31.gif";

  contactUs_bg_on = new Image();
  contactUs_bg_off = new Image();
  contactUs_bg_on.src = "/common/images/nav/pn_contactUs_on_72x31.gif";
  contactUs_bg_off.src = "/common/images/nav/pn_contactUs_off_72x31.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");
    }
  }
}