window.onload = function(){
	var jigyou = document.getElementById("jigyou");
	var touroku = document.getElementById("touroku");
	jigyou.onmouseover = function(){
		this.src = "images/commercial/jigyou_on.jpg";
	}
	jigyou.onmouseout = function(){
		this.src = "images/commercial/jigyou.jpg";
	}
	touroku.onmouseover = function(){
		this.src = "images/commercial/touroku_on.jpg";
	}
	touroku.onmouseout = function(){
		this.src = "images/commercial/touroku.jpg";
	}
}