if (document.images) { 
    Home_on = new Image();           
    Home_on.src =  "/th/images/topNav/kc_Header_Home_over.gif";
    Home_off = new Image();          
    Home_off.src = "/th/images/topNav/kc_Header_Home_off.gif";
    HowToPurch_on = new Image();           
    HowToPurch_on.src =  "/th/images/topNav/kc_Header_HowToPurch_over.gif";
    HowToPurch_off = new Image();          
    HowToPurch_off.src = "/th/images/topNav/kc_Header_HowToPurch_off.gif";
    GlobalSites_on = new Image();           
    GlobalSites_on.src =  "/th/images/topNav/kc_Header_GlobalSites_over.gif";
    GlobalSites_off = new Image();          
    GlobalSites_off.src = "/th/images/topNav/kc_Header_GlobalSites_off.gif";
    CorpInfo_on = new Image();           
    CorpInfo_on.src =  "/th/images/topNav/kc_Header_CorpInfo_over.gif";
    CorpInfo_off = new Image();          
    CorpInfo_off.src = "/th/images/topNav/kc_Header_CorpInfo_off.gif";
    CustNet_on = new Image();           
    CustNet_on.src =  "/th/images/topNav/kc_Header_CustNet_over.gif";
    CustNet_off = new Image();          
    CustNet_off.src = "/th/images/topNav/kc_Header_CustNet_off.gif";
}