function open1th() {
	MM_preloadImages('images/top_bt01_l.gif','images/top_bt02_l.gif','images/top_bt03_l.gif','images/line_bt01_l.gif','images/line_bt02_l.gif','images/line_bt03_l.gif','images/line_bt04_l.gif','images/line_bt05_l.gif','images/line_bt06_l.gif','images/bt02_l.gif','images/bt03_l.gif','images/bt04_l.gif','images/bt05_l.gif','images/bt06_l.gif','images/bt01_l.gif','images/line_bt07_l.gif')
}

function open2th() {
	MM_preloadImages('../images/top_bt01_l.gif','../images/top_bt02_l.gif','../images/top_bt03_l.gif','../images/line_bt01_l.gif','../images/line_bt02_l.gif','../images/line_bt03_l.gif','../images/line_bt04_l.gif','../images/line_bt05_l.gif','../images/line_bt06_l.gif','../images/bt02_l.gif','../images/bt03_l.gif','../images/bt04_l.gif','../images/bt05_l.gif','../images/bt06_l.gif','../images/bt01_l.gif','../images/line_bt07_l.gif','../images/common/bt01_l.gif','../images/common/bt02_l.gif','../images/common/bt03_l.gif','../images/common/bt04_l.gif','../images/common/bt05_l.gif','../images/common/bt06_l.gif','../images/common/bt07_l.gif','../images/common/bt_point_l.gif','../images/common/bt_model_l.gif','../images/common/bt_album_l.gif','../images/common/bt_koji_l.gif','../images/common/bt_mom_l.gif','../images/common/bt_father_l.gif','../images/common/bt_child_l.gif','../images/common/bt_family_l.gif','images/living_l.gif','images/kitchen_l.gif','images/sanitary_l.gif','images/entrance_l.gif','images/room_l.gif','images/layout_k.gif','images/layout_s.gif','images/layout_e.gif','images/layout_r.gif','images/layout_ld.gif')
}

function open3th() {
	MM_preloadImages('../../images/top_bt01_l.gif','../../images/top_bt02_l.gif','../../images/top_bt03_l.gif','../../images/line_bt01_l.gif','../../images/line_bt02_l.gif','../../images/line_bt03_l.gif','../../images/line_bt04_l.gif','../../images/line_bt05_l.gif','../../images/line_bt06_l.gif','../../images/bt02_l.gif','../../images/bt03_l.gif','../../images/bt04_l.gif','../../images/bt05_l.gif','../../images/bt06_l.gif','../../images/bt01_l.gif','../../images/line_bt07_l.gif','../../images/common/bt01_l.gif','../../images/common/bt02_l.gif','../../images/common/bt03_l.gif','../../images/common/bt04_l.gif','../../images/common/bt05_l.gif','../../images/common/bt06_l.gif','../../images/common/bt07_l.gif','../../images/common/bt_point_l.gif','../../images/common/bt_model_l.gif','../../images/common/bt_album_l.gif','../../images/common/bt_koji_l.gif','../../images/common/bt_mom_l.gif','../../images/common/bt_father_l.gif','../../images/common/bt_child_l.gif','../../images/common/bt_family_l.gif')
}