<!-- 
if (document.images) { 
//define the left navigator button here
    Buttons_about_history_on = new Image();
    Buttons_about_history_on.src = "../images/leftnav/about/about_history_on.gif";
    Buttons_about_history_off = new Image();
    Buttons_about_history_off.src = "../images/leftnav/about/about_history_off.gif";
    
    Buttons_about_careers_on = new Image();
    Buttons_about_careers_on.src = "../images/leftnav/about/about_careers_on.gif";
    Buttons_about_careers_off = new Image();
    Buttons_about_careers_off.src = "../images/leftnav/about/about_careers_off.gif";
    
    Buttons_about_locations_on = new Image();
    Buttons_about_locations_on.src = "../images/leftnav/about/about_locations_on.gif";
    Buttons_about_locations_off = new Image();
    Buttons_about_locations_off.src = "../images/leftnav/about/about_locations_off.gif";
    
}
//-->