function calculate(){
	//--------------------------------------------------------
	//   初期設定                                             
	//--------------------------------------------------------
	//単価
	var price_id = 'en1251258077';
	
	//数量
	var num_id = 'en1251277866';
	
	//ご注文金額小計
	var order_sub_id = 'en1251277926';
	
	//送付先
	var send_id = 'en1251277684';
	
	//送料
	var ship_id = 'en1251258110';
	
	//ご注文金額総合計
	var order_total_id = 'en1251258139';
	
	//送料単価
	var send_standard = 735;
	var send_etc = 1050;
	
	//--------------------------------------------------------
	//   計算                                                 
	//--------------------------------------------------------
	//ご注文金額小計計算
	var sub_price = eval(document.getElementById(price_id).value) * eval(document.getElementById(num_id).value);
	document.getElementById(order_sub_id).value = sub_price;
	
	//送料計算
	var ship_num = eval(document.getElementById(num_id).value) / 5;
	var ship_sub_price = Math.ceil(ship_num);
	if(document.getElementById(send_id).value == '本州・四国'){
		var ship_total_price = ship_sub_price * send_standard;
	}else if(document.getElementById(send_id).value == 'そのほかの地域'){
		var ship_total_price = ship_sub_price * send_etc;
	}else{
		var ship_total_price = 0;
	}
	document.getElementById(ship_id).value = ship_total_price;
	
	//総合計計算
	document.getElementById(order_total_id).value = sub_price + ship_total_price;
	
	
}