ソース <div onscroll="display_account()"> <script type="text/javascript"> <!-- function keisan(){ // 計算開始 var tax = 5; // 消費税率 var price1 = eval(document.form1.goods1.value) * document.form1.volume1 .selectedIndex; // 数量×単価 var price2 = eval(document.form1.goods2.value) * document.form1.volume2 .selectedIndex; var price3 = eval(document.form1.goods3.value) * document.form1.volume3 .selectedIndex; var