if (document.images) {

		var img1on = new Image();
		img1on.src = "images/plan_ex_on.gif"; // ポイント時の画像
		var img1off = new Image();
		img1off.src = "images/plan_ex.gif"; // 通常の画像

		var img2on = new Image();
		img2on.src = "images/plan_ea_on.gif";
		var img2off = new Image();
		img2off.src = "images/plan_ea.gif";

		var img3on = new Image();
		img3on.src = "images/plan_ba_on.gif";
		var img3off = new Image();
		img3off.src = "images/plan_ba.gif";

		var img4on = new Image();
		img4on.src = "images/plan_ne_on.gif";
		var img4off = new Image();
		img4off.src = "images/plan_ne.gif";
		}

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

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