//preload images, then onmouseover & mouseout functions

if (document.images)  {
        
  nav_subabout_1 = new Image; nav_subabout_1.src = '../img/nav_subabout_1.gif';
  nav_subabout_2 = new Image; nav_subabout_2.src = '../img/nav_subabout_2.gif';

  nav_principals_1 = new Image; nav_principals_1.src = '../img/nav_principals_1.gif';
  nav_principals_2 = new Image; nav_principals_2.src = '../img/nav_principals_2.gif';

  nav_clientlist_1 = new Image; nav_clientlist_1.src = '../img/nav_clientlist_1.gif';
  nav_clientlist_2 = new Image; nav_clientlist_2.src = '../img/nav_clientlist_2.gif';  
  
  nav_news_1 = new Image; nav_news_1.src = '../img/nav_news_1.gif';
  nav_news_2 = new Image; nav_news_2.src = '../img/nav_news_2.gif';  
}

function rollOverC(name) {
        if (document.images) {
                document.images[name].src = eval('nav_' + name + '_2.src');
        }
}

function rollOffC(name) {
        
        if (document.images) {
                document.images[name].src = eval('nav_' + name + "_1.src");
        }
}