if (document.images) {

 my_accounton = new Image();
 my_accounton.src = "/images/menu_my_account_on.gif";

 my_accountoff = new Image();
 my_accountoff.src = "/images/menu_my_account_off.gif";

 my_carton = new Image();
 my_carton.src = "/images/menu_my_cart_on.gif";

 my_cartoff = new Image();
 my_cartoff.src = "/images/menu_my_cart_off.gif";

 check_outon = new Image();
 check_outon.src = "/images/menu_checkout_on.gif";

 check_outoff = new Image();
 check_outoff.src = "/images/menu_checkout_off.gif";

 homeon = new Image();
 homeon.src = "/images/menu_home_on.gif";

 homeoff = new Image();
 homeoff.src = "/images/menu_home_off.gif";

 about_uson = new Image();
 about_uson.src = "/images/menu_about_us_on.gif";

 about_usoff = new Image();
 about_usoff.src = "/images/menu_about_us_off.gif";

 capabilitieson = new Image();
 capabilitieson.src = "/images/menu_capabilities_on.gif";

 capabilitiesoff = new Image();
 capabilitiesoff.src = "/images/menu_capabilities_off.gif";

 contract_manufacturingon = new Image();
 contract_manufacturingon.src = "/images/menu_contract_manufacturing_on.gif";

 contract_manufacturingoff = new Image();
 contract_manufacturingoff.src = "/images/menu_contract_manufacturing_off.gif";

 documentationon = new Image();
 documentationon.src = "/images/menu_documentation_on.gif";

 documentationoff = new Image();
 documentationoff.src = "/images/menu_documentation_off.gif";

 contact_uson = new Image();
 contact_uson.src = "/images/menu_contact_us_on.gif";

 contact_usoff = new Image();
 contact_usoff.src = "/images/menu_contact_us_off.gif";

 enzyme_substrateson = new Image();
 enzyme_substrateson.src = "/images/menu_enzyme_substrates_on.gif";

 enzyme_substratesoff = new Image();
 enzyme_substratesoff.src = "/images/menu_enzyme_substrates_off.gif";

 inducers_and_detergentson = new Image();
 inducers_and_detergentson.src = "/images/menu_inducers_and_detergents_on.gif";

 inducers_and_detergentsoff = new Image();
 inducers_and_detergentsoff.src = "/images/menu_inducers_and_detergents_off.gif";

 antibioticson = new Image();
 antibioticson.src = "/images/menu_antibiotics_on.gif";

 antibioticsoff = new Image();
 antibioticsoff.src = "/images/menu_antibiotics_off.gif";

 other_fine_chemicalson = new Image();
 other_fine_chemicalson.src = "/images/menu_other_fine_chemicals_on.gif";

 other_fine_chemicalsoff = new Image();
 other_fine_chemicalsoff.src = "/images/menu_other_fine_chemicals_off.gif";

}