if (document.images) {
	btn_mae_on = new Image();
	btn_mae_on.src = "/mgda/images/btn_mae_01_on.gif";
	btn_mae = new Image();
	btn_mae.src = "/mgda/images/btn_mae_01.gif";

	btn_saishu_on = new Image();
	btn_saishu_on.src = "/mgda/images/btn_saishu_01_on.gif";
	btn_saishu = new Image();
	btn_saishu.src = "/mgda/images/btn_saishu_01.gif";

	btn_clear_on = new Image();
	btn_clear_on.src = "/mgda/images/btn_clear_01_on.gif";
	btn_clear = new Image();
	btn_clear.src = "/mgda/images/btn_clear_01.gif";

	btn_search_on = new Image();
	btn_search_on.src = "/mgda/images/btn_search_01_on.gif";
	btn_search = new Image();
	btn_search.src = "/mgda/images/btn_search_01.gif";

	btn_sentou_on = new Image();
	btn_sentou_on.src = "/mgda/images/btn_sentou_01_on.gif";
	btn_sentou = new Image();
	btn_sentou.src = "/mgda/images/btn_sentou_01.gif";

	btn_shukushou_on = new Image();
	btn_shukushou_on.src = "/mgda/images/btn_shukushou_01_on.gif";
	btn_shukushou = new Image();
	btn_shukushou.src = "/mgda/images/btn_shukushou_01.gif";

	btn_tsugi_on = new Image();
	btn_tsugi_on.src = "/mgda/images/btn_tsugi_01_on.gif";
	btn_tsugi = new Image();
	btn_tsugi.src = "/mgda/images/btn_tsugi_01.gif";

	btn_kakudai_on = new Image();
	btn_kakudai_on.src = "/mgda/images/btn_kakudai_01_on.gif";
	btn_kakudai = new Image();
	btn_kakudai.src = "/mgda/images/btn_kakudai_01.gif";

	btn_hyouji1_on = new Image();
	btn_hyouji1_on.src = "/mgda/images/btn_hyouji_01_on.gif";
	btn_hyouji1 = new Image();
	btn_hyouji1.src = "/mgda/images/btn_hyouji_01.gif";

	btn_hyouji2_on = new Image();
	btn_hyouji2_on.src = "/mgda/images/btn_hyouji_01_on.gif";
	btn_hyouji2 = new Image();
	btn_hyouji2.src = "/mgda/images/btn_hyouji_01.gif";

	btn_hyouji3_on = new Image();
	btn_hyouji3_on.src = "/mgda/images/btn_hyouji_01_on.gif";
	btn_hyouji3 = new Image();
	btn_hyouji3.src = "/mgda/images/btn_hyouji_01.gif";
}
function imageOn(imageName){
	document.getElementById(imageName).src = eval(imageName+"_on.src");
}
function imageOff(imageName){
	document.getElementById(imageName).src = eval(imageName+".src");
}