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if (document.images) {

	/* contact */

	var c1on = new Image();
	c1on.src = "img/contacton.gif";
	var c1off = new Image();
	c1off.src = "img/contact.gif";

	/* pc-3000 */

	var p1on = new Image();
	p1on.src = "img/workbenchon.jpg";
	var p1off = new Image();
	p1off.src = "img/workbench.jpg";

	var p2on = new Image();
	p2on.src = "img/proboxon.jpg";
	var p2off = new Image();
	p2off.src = "img/probox.jpg";

	var p3on = new Image();
	p3on.src = "img/mobileworkson.jpg";
	var p3off = new Image();
	p3off.src = "img/mobileworks.jpg";

	var p4on = new Image();
	p4on.src = "img/portableon.jpg";
	var p4off = new Image();
	p4off.src = "img/portable.jpg";

	var p5on = new Image();
	p5on.src = "img/flashon.jpg";
	var p5off = new Image();
	p5off.src = "img/flash.jpg";

	var p6on = new Image();
	p6on.src = "img/udmaon.jpg";
	var p6off = new Image();
	p6off.src = "img/udma.jpg";

	var p7on = new Image();
	p7on.src = "img/deudmaon.jpg";
	var p7off = new Image();
	p7off.src = "img/deudma.jpg";

	var p8on = new Image();
	p8on.src = "img/scsion.jpg";
	var p8off = new Image();
	p8off.src = "img/scsi.jpg";

	var p9on = new Image();
	p9on.src = "img/descsion.jpg";
	var p9off = new Image();
	p9off.src = "img/descsi.jpg";

	/* navi */

	var n1on = new Image();
	n1on.src = "img/applicationon.jpg";
	var n1off = new Image();
	n1off.src = "img/application.jpg";

	var n2on = new Image();
	n2on.src = "img/requeston.jpg";
	var n2off = new Image();
	n2off.src = "img/request.jpg";

}

/* 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) {
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}