if (document.images) {

// main navigation
  about = new Image();
  about.src = "/images/topbar/about.gif";
  about_on = new Image();
  about_on.src = "/images/topbar/about_on.gif";
  
  products = new Image();
  products.src = "/images/topbar/products.gif";
  products_on = new Image();
  products_on.src = "/images/topbar/products_on.gif";
  
  services = new Image();
  services.src = "/images/topbar/services.gif";
  services_on = new Image();
  services_on.src = "/images/topbar/services_on.gif";
  
  newsletter = new Image();
  newsletter.src = "/images/topbar/newsletter.gif";
  newsletter_on = new Image();
  newsletter_on.src = "/images/topbar/newsletter_on.gif";
  
  contact = new Image();
  contact.src = "/images/topbar/contact.gif";
  contact_on = new Image();
  contact_on.src = "/images/topbar/contact_on.gif";
  
  e3000k = new Image();
  e3000k.src = "/images/bottombar/3000k.gif";
  e3000k_on = new Image();
  e3000k_on.src = "/images/bottombar/3000k_on.gif";
  
  
// services
  needs_analysis = new Image();
  needs_analysis.src = "/images/buttons/needs_analysis.gif";
  needs_analysis_on = new Image();
  needs_analysis_on.src = "/images/buttons/needs_analysis_on.gif";
  
  computer_support = new Image();
  computer_support.src = "/images/buttons/computer_support.gif";
  computer_support_on = new Image();
  computer_support_on.src = "/images/buttons/computer_support_on.gif";
  
  network_services = new Image();
  network_services.src = "/images/buttons/network_services.gif";
  network_services_on = new Image();
  network_services_on.src = "/images/buttons/network_services_on.gif";
  
  macintosh_support = new Image();
  macintosh_support.src = "/images/buttons/macintosh_support.gif";
  macintosh_support_on = new Image();
  macintosh_support_on.src = "/images/buttons/macintosh_support_on.gif";
  
  computer_repair = new Image();
  computer_repair.src = "/images/buttons/computer_repair.gif";
  computer_repair_on = new Image();
  computer_repair_on.src = "/images/buttons/computer_repair_on.gif";
  
  remote_administration = new Image();
  remote_administration.src = "/images/buttons/remote_administration.gif";
  remote_administration_on = new Image();
  remote_administration_on.src = "/images/buttons/remote_administration_on.gif";
  
  antivirus = new Image();
  antivirus.src = "/images/buttons/antivirus.gif";
  antivirus_on = new Image();
  antivirus_on.src = "/images/buttons/antivirus_on.gif";
  
  disaster = new Image();
  disaster.src = "/images/buttons/disaster.gif";
  disaster_on = new Image();
  disaster_on.src = "/images/buttons/disaster_on.gif";
  
  help_desk = new Image();
  help_desk.src = "/images/buttons/help_desk.gif";
  help_desk_on = new Image();
  help_desk_on.src = "/images/buttons/help_desk_on.gif";
  

// products
  computer_systems = new Image();
  computer_systems.src = "/images/buttons/computer_systems.gif";
  computer_systems_on = new Image();
  computer_systems_on.src = "/images/buttons/computer_systems_on.gif";
  
  internet_only_specials = new Image();
  internet_only_specials.src = "/images/buttons/internet_only_specials.gif";
  internet_only_specials_on = new Image();
  internet_only_specials_on.src = "/images/buttons/internet_only_specials_on.gif";
  
  network_equipment = new Image();
  network_equipment.src = "/images/buttons/network_equipment.gif";
  network_equipment_on = new Image();
  network_equipment_on.src = "/images/buttons/network_equipment_on.gif";
  
  printers = new Image();
  printers.src = "/images/buttons/printers.gif";
  printers_on = new Image();
  printers_on.src = "/images/buttons/printers_on.gif";
  
  accessories = new Image();
  accessories.src = "/images/buttons/accessories.gif";
  accessories_on = new Image();
  accessories_on.src = "/images/buttons/accessories_on.gif";
  
  computer_software = new Image();
  computer_software.src = "/images/buttons/computer_software.gif";
  computer_software_on = new Image();
  computer_software_on.src = "/images/buttons/computer_software_on.gif";
  
  quickbooks = new Image();
  quickbooks.src = "/images/buttons/quickbooks.gif";
  quickbooks_on = new Image();
  quickbooks_on.src = "/images/buttons/quickbooks_on.gif";
  
  antispam = new Image();
  antispam.src = "/images/buttons/antispam.gif";
  antispam_on = new Image();
  antispam_on.src = "/images/buttons/antispam_on.gif";
  
  //surveillancesystems = new Image();
  //surveillancesystems.src = "/images/buttons/surveillancesystems.gif";
  //surveillancesystems_on = new Image();
  //surveillancesystems_on.src = "/images/buttons/surveillancesystems_on.gif";
  
  
  
// newsletter
  newsletter_archives = new Image();
  newsletter_archives.src = "/images/buttons/newsletter_archives.gif";
  newsletter_archives_on = new Image();
  newsletter_archives_on.src = "/images/buttons/newsletter_archives_on.gif";
  
  signup_now = new Image();
  signup_now.src = "/images/buttons/signup_now.gif";
  signup_now_on = new Image();
  signup_now_on.src = "/images/buttons/signup_now_on.gif";
  
  
// contact
  service_request_form = new Image();
  service_request_form.src = "/images/buttons/service_request_form.gif";
  service_request_form_on = new Image();
  service_request_form_on.src = "/images/buttons/service_request_form_on.gif";
  
  information_request_form = new Image();
  information_request_form.src = "/images/buttons/information_request_form.gif";
  information_request_form_on = new Image();
  information_request_form_on.src = "/images/buttons/information_request_form_on.gif";
  
  
// about
  background_history = new Image();
  background_history.src = "/images/buttons/background_history.gif";
  background_history_on = new Image();
  background_history_on.src = "/images/buttons/background_history_on.gif";
  
  staff_biographies = new Image();
  staff_biographies.src = "/images/buttons/staff_biographies.gif";
  staff_biographies_on = new Image();
  staff_biographies_on.src = "/images/buttons/staff_biographies_on.gif";
  
  privacy_policy = new Image();
  privacy_policy.src = "/images/buttons/privacy_policy.gif";
  privacy_policy_on = new Image();
  privacy_policy_on.src = "/images/buttons/privacy_policy_on.gif";
  
  affiliations_partners = new Image();
  affiliations_partners.src = "/images/buttons/affiliations_partners.gif";
  affiliations_partners_on = new Image();
  affiliations_partners_on.src = "/images/buttons/affiliations_partners_on.gif";
  
  testimonials = new Image();
  testimonials.src = "/images/buttons/testimonials.gif";
  testimonials_on = new Image();
  testimonials_on.src = "/images/buttons/testimonials_on.gif";
  
}

function switchOn(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + "_on.src");
    }
}
  
function switchOff(imgName) {
    if (document.images) {
      document[imgName].src = eval(imgName + ".src");
    }
}