if (document.images) {
hom_on = new Image();	hom_on.src = "images/b_home_on.gif";
hom_off = new Image();	hom_off.src = "images/b_home_off.gif";
abo_on = new Image();	abo_on.src = "images/b_about_on.gif";
abo_off = new Image();	abo_off.src = "images/b_about_off.gif";
ser_on = new Image();	ser_on.src = "images/b_services_on.gif";
ser_off = new Image();	ser_off.src = "images/b_services_off.gif";
cas_on = new Image();	cas_on.src = "images/b_cases_on.gif";
cas_off = new Image();	cas_off.src = "images/b_cases_off.gif";
res_on = new Image();	res_on.src = "images/b_resources_on.gif";
res_off = new Image();	res_off.src = "images/b_resources_off.gif";
con_on = new Image();	con_on.src = "images/b_contact_on.gif";
con_off = new Image();	con_off.src = "images/b_contact_off.gif";
upd_on = new Image();	upd_on.src = "images/b_updates_on.gif";
upd_off = new Image();	upd_off.src = "images/b_updates_off.gif";
}
function swapem(sname,rname) {
sname.src = rname.src;
}