if (document.images) {
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  butabout_f1 = new Image(124 ,24); butabout_f1.src = "images/but-about.gif";
  butawards_f2 = new Image(124 ,24); butawards_f2.src = "images/but-awards_f2.gif";
  butawards_f1 = new Image(124 ,24); butawards_f1.src = "images/but-awards.gif";
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  but_conference_f1 = new Image(124 ,24); but_conference_f1.src = "images/but_conference.gif";
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  butadvisory_f1 = new Image(124 ,24); butadvisory_f1.src = "images/but-advisory.gif";
  butadvisory_f2 = new Image(124 ,24); butadvisory_f2.src = "images/but-advisory_f2.gif";
  butregistration_f1 = new Image(124 ,24); butregistration_f1.src = "images/but-registration.gif";
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  butsponsors_f1 = new Image(124 ,24); butsponsors_f1.src = "images/but-sponsors.gif";
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  butpressroom_f1 = new Image(124 ,24); butpressroom_f1.src = "images/but-pressroom.gif";
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  butlink_f1 = new Image(124 ,24); butlink_f1.src = "images/but-link.gif";
  butcontactus_f2 = new Image(124 ,24); butcontactus_f2.src = "images/but-contactus_f2.gif";
  butcontactus_f1 = new Image(124 ,24); butcontactus_f1.src = "images/but-contactus.gif";
  butletterpmo_f2 = new Image(124 ,40); butletterpmo_f2.src = "images/but-letterpmo_f2.gif";
  butletterpmo_f1 = new Image(124 ,40); butletterpmo_f1.src = "images/but-letterpmo.gif";
  butletterpremier_f2 = new Image(124 ,41); butletterpremier_f2.src = "images/but-letterpremier_f2.gif";
  butletterpremier_f1 = new Image(124 ,41); butletterpremier_f1.src = "images/but-letterpremier.gif";
  butlettermayor_f2 = new Image(124 ,40); butlettermayor_f2.src = "images/but-lettermayor_f2.gif";
  butlettermayor_f1 = new Image(124 ,40); butlettermayor_f1.src = "images/but-lettermayor.gif";
  }