// JavaScript Document
if (document.images) {
img1on = new Image();
img1on.src = "image/bt_01_on.gif";
img2on = new Image();
img2on.src = "image/bt_02_on.gif";
img3on = new Image();
img3on.src = "image/bt_03_on.gif";
img4on = new Image();
img4on.src = "image/bt_04_on.gif";
img5on = new Image();
img5on.src = "image/bt_05_on.gif";
img6on = new Image();
img6on.src = "image/bt_06_on.gif";

//
img1off = new Image();
img1off.src = "image/bt_01_off.gif";
img2off = new Image();
img2off.src = "image/bt_02_off.gif";
img3off = new Image();
img3off.src = "image/bt_03_off.gif";
img4off = new Image();
img4off.src = "image/bt_04_off.gif";
img5off = new Image();
img5off.src = "image/bt_05_off.gif";
img6off = new Image();
img6off.src = "image/bt_06_off.gif";

}
function imgOn(imgName) {
if (document.images) {
	document[imgName].src = eval(imgName + "on.src");
}
}
function imgOff(imgName) {
if (document.images) {
	document[imgName].src = eval(imgName + "off.src");
}
}