下面的代码可以很简单地隐藏和显示页面内容:
<script>
   function display(d){
       if(d == 0){
           s1.style.display="block";
       }else{
           s1.style.display="none";
       }
   }
</script>

<select name="Other1" size="1" onchange="display(this.value)">
  <option>无</option>
  <option value=0>显示流水号</option>
  <option value=1>包长度</option>
</select>

<div style="display:none" id="s1">
流水号最大值:<input name="Max1" type="text" size="15" maxlength="15">
流水号最小值:<input name="Min1" type="text" size="15" maxlength="15">
</div>