用javaScript动态修改html组件form的action属性，可以在提交时再决定处理表单的页面。

         <script>
             <!--
             function chgAction(v){
                 if(v==1){
                     form1.action="./newworksheet";
                 }else if(v==2){
                     form1.action="./worksheetupdate";
                 }
                 form1.submit();
             }
             -->
       </script>

<form method="post" name="form1" action="">
<input name="worker" type="text" size="50" value="" />
<input type="submit" value="添加" name="add" onclick="chgAction(1);" />
<input type="submit" value="修改" name="update" onclick="chgAction(2);" />
</form>