if (document.images)
{
  top_menu_item_1_on         = new Image();  top_menu_item_1_on.src         = "img/top_menu_item_1_on.gif";
  top_menu_item_1_off        = new Image();  top_menu_item_1_off.src        = "img/top_menu_item_1_off.gif";
  top_menu_item_2_on         = new Image();  top_menu_item_2_on.src         = "img/top_menu_item_2_on.gif";
  top_menu_item_2_off        = new Image();  top_menu_item_2_off.src        = "img/top_menu_item_2_off.gif";
  top_menu_item_3_on         = new Image();  top_menu_item_3_on.src         = "img/top_menu_item_3_on.gif";
  top_menu_item_3_off        = new Image();  top_menu_item_3_off.src        = "img/top_menu_item_3_off.gif";
  top_menu_item_4_on         = new Image();  top_menu_item_4_on.src         = "img/top_menu_item_4_on.gif";
  top_menu_item_4_off        = new Image();  top_menu_item_4_off.src        = "img/top_menu_item_4_off.gif";
  top_menu_item_5_on         = new Image();  top_menu_item_5_on.src         = "img/top_menu_item_5_on.gif";
  top_menu_item_5_off        = new Image();  top_menu_item_5_off.src        = "img/top_menu_item_5_off.gif";
  top_menu_item_6_on         = new Image();  top_menu_item_6_on.src         = "img/top_menu_item_6_on.gif";
  top_menu_item_6_off        = new Image();  top_menu_item_6_off.src        = "img/top_menu_item_6_off.gif";
  top_menu_item_7_on         = new Image();  top_menu_item_7_on.src         = "img/top_menu_item_7_on.gif";
  top_menu_item_7_off        = new Image();  top_menu_item_7_off.src        = "img/top_menu_item_7_off.gif";
  top_menu_item_8_on         = new Image();  top_menu_item_8_on.src         = "img/top_menu_item_8_on.gif";
  top_menu_item_8_off        = new Image();  top_menu_item_8_off.src        = "img/top_menu_item_8_off.gif";

   left_menu_i1_on         = new Image();  left_menu_i1_on.src         = "img/left_menu_i1_on.gif";
   left_menu_i1_off        = new Image();  left_menu_i1_off.src        = "img/left_menu_i1_off.gif";

   left_menu_i2_on         = new Image();  left_menu_i2_on.src         = "img/left_menu_i2_on.gif";
   left_menu_i2_off        = new Image();  left_menu_i2_off.src        = "img/left_menu_i2_off.gif";
   
   button_right_on         = new Image();  button_right_on.src         = "img/button_right_on.gif";
   button_right_off        = new Image();  button_right_off.src        = "img/button_right_off.gif";

}