if (document.images) {

// 画像1
var img1on = new Image();
img1on.src = "http://www.gipservice.com/images/btn01on.gif";
var img1off = new Image();
img1off.src = "http://www.gipservice.com/images/btn01.gif";

// 画像2
var img2on = new Image();
img2on.src = "http://www.gipservice.com/images/btn02on.gif";
var img2off = new Image();
img2off.src = "http://www.gipservice.com/images/btn02.gif";

// 画像3
var img3on = new Image();
img3on.src = "http://www.gipservice.com/images/btn03on.gif";
var img3off = new Image();
img3off.src = "http://www.gipservice.com/images/btn03.gif";

// 画像4
var img4on = new Image();
img4on.src = "http://www.gipservice.com/images/btn04on.gif";
var img4off = new Image();
img4off.src = "http://www.gipservice.com/images/btn04.gif";

// 画像5
var img5on = new Image();
img5on.src = "http://www.gipservice.com/images/btn05on.gif";
var img5off = new Image();
img5off.src = "http://www.gipservice.com/images/btn05.gif";

// 画像6
var img6on = new Image();
img6on.src = "http://www.gipservice.com/images/btn06on.gif";
var img6off = new Image();
img6off.src = "http://www.gipservice.com/images/btn06.gif";

// 画像7
var img7on = new Image();
img7on.src = "http://www.gipservice.com/images/btn07on.gif";
var img7off = new Image();
img7off.src = "http://www.gipservice.com/images/btn07.gif";
}

// ポイント時の処理
function On(name) {

if (document.images) {
document.images[name].src = eval(name + 'on.src');
}

}

// 放した時の処理
function Off(name) {

if (document.images) {
document.images[name].src = eval(name + 'off.src');
}

}