if (document.images) {
  nav1_up = new Image
  nav1_over = new Image
  nav2_up = new Image
  nav2_over = new Image
  nav3_up = new Image
  nav3_over = new Image
  nav4_up = new Image
  nav4_over = new Image
  nav5_up = new Image
  nav5_over = new Image
  nav6_up = new Image
  nav6_over = new Image
  nav7_up = new Image
  nav7_over = new Image
  
  
  nav1_up.src = 'images/nav_h_military.jpg'
  nav1_over.src = 'images/nav_h_military_over.jpg'
  nav2_up.src = 'images/nav_h_homeland.jpg'
  nav2_over.src = 'images/nav_h_homeland_over.jpg'
  nav3_up.src = 'images/nav_h_camfire.jpg'
  nav3_over.src = 'images/nav_h_camfire_over.jpg'
  nav4_up.src = 'images/nav_h_base.jpg'
  nav4_over.src = 'images/nav_h_base_over.jpg'
  nav5_up.src = 'images/nav_h_arc.jpg'
  nav5_over.src = 'images/nav_h_arc_over.jpg'
  nav6_up.src = 'images/nav_h_power.jpg'
  nav6_over.src = 'images/nav_h_power_over.jpg'
  nav7_up.src = 'images/nav_h_newWorld.jpg'
  nav7_over.src = 'images/nav_h_newWorld_over.jpg'
  
  }

else {
  nav1_up = ""
  nav1_over = ""
  nav2_up = ""
  nav2_over = ""
  nav3_up = ""
  nav3_over = ""
  nav4_up = ""
  nav4_over = ""
  nav5_up = ""
  nav5_over = ""
  nav6_up = ""
  nav6_over = ""
  nav6_up = ""
  nav6_over = ""
  
  document.nav1 = ""
  document.nav2 = ""
  document.nav3 = ""
  document.nav4 = ""
  document.nav5 = ""
  document.nav6 = ""
  document.nav7 = ""  
}