if (document.images) {

var navi_1 = new Image()
navi_1.src = "images/navi_btn_01_off.gif";
var navi_1_2 = new Image()
navi_1_2.src = "images/navi_btn_01_on.gif";

var navi_2 = new Image()
navi_2.src = "images/navi_btn_02_off.gif";
var navi_2_2 = new Image()
navi_2_2.src = "images/navi_btn_02_on.gif";

var navi_3 = new Image()
navi_3.src = "images/navi_btn_03_off.gif";
var navi_3_2 = new Image()
navi_3_2.src = "images/navi_btn_03_on.gif";

var navi_4 = new Image()
navi_4.src = "images/navi_btn_04_off.gif";
var navi_4_2 = new Image()
navi_4_2.src = "images/navi_btn_04_on.gif";

var navi_5 = new Image()
navi_5.src = "images/navi_btn_05_off.gif";
var navi_5_2 = new Image()
navi_5_2.src = "images/navi_btn_05_on.gif";

var navi_6 = new Image()
navi_6.src = "images/navi_btn_06_off.gif";
var navi_6_2 = new Image()
navi_6_2.src = "images/navi_btn_06_on.gif";

var navi_7 = new Image()
navi_7.src = "images/navi_btn_07_off.gif";
var navi_7_2 = new Image()
navi_7_2.src = "images/navi_btn_07_on.gif";

var navi_8 = new Image()
navi_8.src = "images/navi_btn_08_off.gif";
var navi_8_2 = new Image()
navi_8_2.src = "images/navi_btn_08_on.gif";

var navi_9 = new Image()
navi_9.src = "images/navi_btn_09_off.gif";
var navi_9_2 = new Image()
navi_9_2.src = "images/navi_btn_09_on.gif";

var navi_10 = new Image()
navi_10.src = "images/navi_btn_10_off.gif";
var navi_10_2 = new Image()
navi_10_2.src = "images/navi_btn_10_on.gif";

}

var spec_btn_01 = new Image()
spec_btn_01.src = "images/spec_btn_01_off.gif";
var spec_btn_01_2 = new Image()
spec_btn_01_2.src = "images/spec_btn_01_on.gif";

function act(imgName) {
	if (document.images)
	document[imgName].src = eval(imgName + '_2.src')
}

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