// pre-loads top nav hover and at images

if (document.images)
{
  nav1-hover = new Image; 
  nav1-hover.src = "/public/images/top_nav_links/home-hover.gif"; 
  nav1-at = new Image; 
  nav1-at.src = "/public/images/top_nav_links/home-at.gif"; 

  nav2-hover = new Image; 
  nav2-hover.src = "/public/images/top_nav_links/services-hover.gif"; 
  nav2-at = new Image; 
  nav2-at.src = "/public/images/top_nav_links/services-at.gif"; 

  nav3-hover = new Image; 
  nav3-hover.src = "/public/images/top_nav_links/portfolio-hover.gif"; 
  nav3-at = new Image; 
  nav3-at.src = "/public/images/top_nav_links/portfolio-at.gif"; 

  nav4-hover = new Image; 
  nav4-hover.src = "/public/images/top_nav_links/about-hover.gif"; 
  nav4-at = new Image; 
  nav4-at.src = "/public/images/top_nav_links/about-at.gif"; 

  nav5-hover = new Image; 
  nav5-hover.src = "/public/images/top_nav_links/contact-hover.gif"; 
  nav5-at = new Image; 
  nav5-at.src = "/public/images/top_nav_links/contact-at.gif"; 
}