menu01on = new Image(116, 56);
menu01on.src = "pic/bt-mail-b.gif";
menu02on = new Image(189, 38);
menu02on.src = "pic/bt-kagi-b.gif";
menu03on = new Image(205, 38);
menu03on.src = "pic/bt-tabi-b.gif";
menu04on = new Image(189, 38);
menu04on.src = "pic/bt-asobi-b.gif";
menu05on = new Image(205, 38);
menu05on.src = "pic/bt-touroku-b.gif";
menu06on = new Image(189, 39);
menu06on.src = "pic/bt-faq-b.gif";
menu07on = new Image(205, 39);
menu07on.src = "pic/bt-support-b.gif";

menu01off = new Image(116, 56);
menu01off.src = "pic/bt-mail-a.gif";
menu02off = new Image(189, 38);
menu02off.src = "pic/bt-kagi-a.gif";
menu03off = new Image(205, 38);
menu03off.src = "pic/bt-tabi-a.gif";
menu04off = new Image(189, 38);
menu04off.src = "pic/bt-asobi-a.gif";
menu05off = new Image(205, 38);
menu05off.src = "pic/bt-touroku-a.gif";
menu06off = new Image(189, 39);
menu06off.src = "pic/bt-faq-a.gif";
menu07off = new Image(205, 39);
menu07off.src = "pic/bt-support-a.gif";

function img_act(imgName) {
	imgOn = eval(imgName + "on.src");
	document [imgName].src = imgOn;
}

function img_inact(imgName) {
	imgOff = eval(imgName + "off.src");
	document [imgName].src = imgOff;
}