if (document.images) {
var NAV_01 = new Image()
NAV_01.src = "img/navi_top.gif"
var NAV_01_b = new Image()
NAV_01_b.src = "img/navi_top_on.gif"

var NAV_02 = new Image()
NAV_02.src = "img/navi_corp.gif"
var NAV_02_b = new Image()
NAV_02_b.src = "img/navi_corp_on.gif"

var NAV_03 = new Image()
NAV_03.src = "img/navi_pro.gif"
var NAV_03_b = new Image()
NAV_03_b.src = "img/navi_pro_on.gif"

var NAV_04 = new Image()
NAV_04.src = "img/navi_news.gif"
var NAV_04_b = new Image()
NAV_04_b.src = "img/navi_news_on.gif"

var NAV_05 = new Image()
NAV_05.src = "img/navi_recruite.gif"
var NAV_05_b = new Image()
NAV_05_b.src = "img/navi_recruite_on.gif"

var NAV_06 = new Image()
NAV_06.src = "img/navi_inquiry.gif"
var NAV_06_b = new Image()
NAV_06_b.src = "img/navi_inquiry_on.gif"

var NAV_07 = new Image()
NAV_07.src = "img/navi_sitemap.gif"
var NAV_07_b = new Image()
NAV_07_b.src = "img/navi_sitemap_on.gif"

var NAV_08 = new Image()
NAV_08.src = "img/navi_link.gif"
var NAV_08_b = new Image()
NAV_08_b.src = "img/navi_link_on.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')
}