if (document.images) {
   homOn  = new Image(); homOn.src  = "menu/hom_on.gif";
   peoOn  = new Image(); peoOn.src  = "menu/peo_on.gif";
   resOn  = new Image(); resOn.src  = "menu/res_on.gif";
   claOn  = new Image(); claOn.src  = "menu/cla_on.gif";
   pubOn  = new Image(); pubOn.src  = "menu/pub_on.gif";
   chiOn  = new Image(); chiOn.src  = "menu/chi_on.gif";
   homOff = new Image(); homOff.src = "menu/hom_off.gif";
   peoOff = new Image(); peoOff.src = "menu/peo_off.gif";
   resOff = new Image(); resOff.src = "menu/res_off.gif";
   claOff = new Image(); claOff.src = "menu/cla_off.gif";
   pubOff = new Image(); pubOff.src = "menu/pub_off.gif";
   chiOff = new Image(); chiOff.src = "menu/chi_off.gif";
}
else {
   homOn = ""; homOff = ""; document.hom = "";
   peoOn = ""; peoOff = ""; document.ppl = "";
   resOn = ""; resOff = ""; document.res = "";
   claOn = ""; claOff = ""; document.cla = "";
   pubOn = ""; pubOff = ""; document.pub = "";
   chiOn = ""; chiOff = ""; document.chi = "";
}