var toppage_on=new Image();
toppage_on.src="img/interface/btn_toppage_a.gif";
var toppage_off=new Image();
toppage_off.src="img/interface/btn_toppage.gif";
var greeting_on=new Image();
greeting_on.src="img/interface/btn_greeting_a.gif";
var greeting_off=new Image();
greeting_off.src="img/interface/btn_greeting.gif";
var doctor_on=new Image();
doctor_on.src="img/interface/btn_doctor_a.gif";
var doctor_off=new Image();
doctor_off.src="img/interface/btn_doctor.gif";
var menu_on=new Image();
menu_on.src="img/interface/btn_menu_a.gif";
var menu_off=new Image();
menu_off.src="img/interface/btn_menu.gif";
var inside_on=new Image();
inside_on.src="img/interface/btn_inside_a.gif";
var inside_off=new Image();
inside_off.src="img/interface/btn_inside.gif";
var timetable_on=new Image();
timetable_on.src="img/interface/btn_timetable_a.gif";
var timetable_off=new Image();
timetable_off.src="img/interface/btn_timetable.gif";
var access_on=new Image();
access_on.src="img/interface/btn_access_a.gif";
var access_off=new Image();
access_off.src="img/interface/btn_access.gif";
var checkup_on=new Image();
checkup_on.src="img/interface/btn_checkup_a.gif";
var checkup_off=new Image();
checkup_off.src="img/interface/btn_checkup.gif";
var information_on=new Image();
information_on.src="img/interface/btn_information_a.gif";
var information_off=new Image();
information_off.src="img/interface/btn_information.gif";
var nosmoking_on=new Image();
nosmoking_on.src="img/interface/btn_nosmoking_a.gif";
var nosmoking_off=new Image();
nosmoking_off.src="img/interface/btn_nosmoking.gif";
var placenta_on=new Image();
placenta_on.src="img/interface/btn_placenta_a.gif";
var placenta_off=new Image();
placenta_off.src="img/interface/btn_placenta.gif";