if (document.images) {
  nav401_f1 = new Image(180 ,11); nav401_f1.src = "/images/nav4/nav4-01.gif";
  nav402_f2 = new Image(180 ,25); nav402_f2.src = "/images/nav4/nav4-02-over.gif";
  nav402_f1 = new Image(180 ,25); nav402_f1.src = "/images/nav4/nav4-02.gif";
  nav403_f2 = new Image(180 ,25); nav403_f2.src = "/images/nav4/nav4-03-over.gif";
  nav403_f1 = new Image(180 ,25); nav403_f1.src = "/images/nav4/nav4-03.gif";
  nav404_f2 = new Image(180 ,26); nav404_f2.src = "/images/nav4/nav4-04-over.gif";
  nav404_f1 = new Image(180 ,26); nav404_f1.src = "/images/nav4/nav4-04.gif";
  nav405_f2 = new Image(180 ,24); nav405_f2.src = "/images/nav4/nav4-05-over.gif";
  nav405_f1 = new Image(180 ,24); nav405_f1.src = "/images/nav4/nav4-05.gif";
  nav406_f2 = new Image(180 ,25); nav406_f2.src = "/images/nav4/nav4-06-over.gif";
  nav406_f1 = new Image(180 ,25); nav406_f1.src = "/images/nav4/nav4-06.gif";
  nav407_f2 = new Image(180 ,38); nav407_f2.src = "/images/nav4/nav4-07-over.gif";
  nav407_f1 = new Image(180 ,38); nav407_f1.src = "/images/nav4/nav4-07.gif";
  nav408_f2 = new Image(180 ,24); nav408_f2.src = "/images/nav4/nav4-08-over.gif";
  nav408_f1 = new Image(180 ,24); nav408_f1.src = "/images/nav4/nav4-08.gif";
  nav409_f2 = new Image(180 ,26); nav409_f2.src = "/images/nav4/nav4-09-over.gif";
  nav409_f1 = new Image(180 ,26); nav409_f1.src = "/images/nav4/nav4-09.gif";
  nav410_f2 = new Image(180 ,53); nav410_f2.src = "/images/nav4/nav4-10-over.gif";
  nav410_f1 = new Image(180 ,53); nav410_f1.src = "/images/nav4/nav4-10.gif";
  nav411_f2 = new Image(180 ,24); nav411_f2.src = "/images/nav4/nav4-11-over.gif";
  nav411_f1 = new Image(180 ,24); nav411_f1.src = "/images/nav4/nav4-11.gif";
  nav412_f2 = new Image(180 ,24); nav412_f2.src = "/images/nav4/nav4-12-over.gif";
  nav412_f1 = new Image(180 ,24); nav412_f1.src = "/images/nav4/nav4-12.gif";
  nav413_f2 = new Image(180 ,25); nav413_f2.src = "/images/nav4/nav4-13-over.gif";
  nav413_f1 = new Image(180 ,25); nav413_f1.src = "/images/nav4/nav4-13.gif";
  nav414_f1 = new Image(180 ,25); nav414_f1.src = "/images/nav4/nav4-14.gif";
  }