//イメージ　ロールオーバー

	var btn_img = new Array() ;

	btn_img[1] = new Image() ;
		btn_img[1].src = "./images2/button_1_a.jpg" ;

	btn_img[2] = new Image() ;
		btn_img[2].src = "./images2/button_1_b.jpg" ;

	btn_img[3] = new Image() ;
		btn_img[3].src = "./images2/button_2_a.jpg" ;

	btn_img[4] = new Image() ;
		btn_img[4].src = "./images2/button_2_b.jpg" ;

function c_image_btn(name,number)
	{
	document.images[name].src = btn_img[number].src ;
	}