if (document.images)
    {
      pre_ButtonMainOnMouse = new Image(155,41); 
      pre_ButtonMainOnMouse.src="images/ButtonMainOnMouse.gif"; 
      
      pre_ButtonMarshOnMouse = new Image(154,41); 
      pre_ButtonMarshOnMouse.src="images/ButtonMarshOnMouse.gif";

      pre_ButtonIronOnMouse = new Image(142,41); 
      pre_ButtonIronOnMouse.src="images/ButtonIronOnMouse.gif";      

      pre_ButtonForumOnMouse = new Image(122,41); 
      pre_ButtonForumOnMouse.src="images/ButtonForumOnMouse.gif"; 

      pre_ButtonLinksOnMouse = new Image(138,41); 
      pre_ButtonLinksOnMouse.src="images/ButtonLinksOnMouse.gif"; 

      pre_ButtonContactsOnMouse = new Image(149,41); 
      pre_ButtonContactsOnMouse.src="images/ButtonContactsOnMouse.gif"; 
    }