if (document.images) {
var SUB_NAV01 = new Image()
SUB_NAV01.src = "img/subunavi_corp_rinen.gif"
var SUB_NAV01_b = new Image()
SUB_NAV01_b.src = "img/subunavi_corp_rinen_ov.gif"

var SUB_NAV02 = new Image()
SUB_NAV02.src = "img/subunavi_corp_sosiki.gif"
var SUB_NAV02_b = new Image()
SUB_NAV02_b.src = "img/subunavi_corp_sosiki_ov.gif"

var SUB_NAV03 = new Image()
SUB_NAV03.src = "img/subnavi_corp_eigyo.gif"
var SUB_NAV03_b = new Image()
SUB_NAV03_b.src = "img/subnavi_corp_eigyo_ov.gif"

var SUB_NAV04 = new Image()
SUB_NAV04.src = "img/subnavi_corp_jigyo.gif"
var SUB_NAV04_b = new Image()
SUB_NAV04_b.src = "img/subnavi_corp_jigyo_ov.gif"

var SUB_NAV05 = new Image()
SUB_NAV05.src = "img/subnavi_corp_kenkyu.gif"
var SUB_NAV05_b = new Image()
SUB_NAV05_b.src = "img/subnavi_corp_kenkyu_ov.gif"

var SUB_NAV06 = new Image()
SUB_NAV06.src = "img/subnavi_corp_history.gif"
var SUB_NAV06_b = new Image()
SUB_NAV06_b.src = "img/subnavi_corp_history_ov.gif"

var SUB_NAV07 = new Image()
SUB_NAV07.src = "img/subnavi_corp_kanren.gif"
var SUB_NAV07_b = new Image()
SUB_NAV07_b.src = "img/subnavi_corp_kanren_ov.gif"
}

function act(imgName) {
	if (document.images)
	document[imgName].src = eval(imgName + '_b.src')
}

function inact(imgName) {
	if (document.images)
	document[imgName].src = eval(imgName + '.src')
}