if (document.images)
  {
  preload("grey_a1","images/main/greyBtn.gif");
  preload("grey_a2","images/main/redBtn.gif");
  preload("grey_a3","images/main/02intro.gif");
  preload("grey_b1","images/main/greyBtn.gif");
  preload("grey_b2","images/main/redBtn.gif");
  preload("grey_b3","images/main/03company.gif");
  preload("grey_c1","images/main/greyBtn.gif");
  preload("grey_c2","images/main/redBtn.gif");
  preload("grey_c3","images/main/04installation.gif");
  preload("grey_d1","images/main/greyBtn.gif");
  preload("grey_d2","images/main/redBtn.gif");
  preload("grey_d3","images/main/05development.gif");
  preload("grey_e1","images/main/greyBtn.gif");
  preload("grey_e2","images/main/redBtn.gif");
  preload("grey_e3","images/main/06partners.gif");
  preload("grey_f1","images/main/greyBtn.gif");
  preload("grey_f2","images/main/redBtn.gif");
  preload("grey_f3","images/main/07customers.gif");
  preload("grey_g1","images/main/greyBtn.gif");
  preload("grey_g2","images/main/redBtn.gif");
  preload("grey_g3","images/main/08contact.gif");
  }