if (document.images) {
var nav_01 = new Image()
nav_01.src = ''+path+'img/index_navi01_off.jpg'
var nav_01_b = new Image()
nav_01_b.src = ''+path+'img/index_navi01_on.jpg'

var nav_02 = new Image()
nav_02.src = ''+path+'img/index_navi02_off.jpg'
var nav_02_b = new Image()
nav_02_b.src = ''+path+'img/index_navi02_on.jpg'

var nav_03 = new Image()
nav_03.src = ''+path+'img/index_navi03_off.jpg'
var nav_03_b = new Image()
nav_03_b.src = ''+path+'img/index_navi03_on.jpg'

var nav_04 = new Image()
nav_04.src = ''+path+'img/index_navi04_off.jpg'
var nav_04_b = new Image()
nav_04_b.src = ''+path+'img/index_navi04_on.jpg'
}

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')
}