高手帮我做个多行三级联动的代码.我是新手.

高手帮我做个多行三级联动的代码.用途:我用ASP做了一全销售开单,要实现多行选商品,
因为商品不能一件件开单给客户呀,如高手有别的方法实现我的用用途,教我一下,

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说具体一点,是不是三个都是多选呢? 比如A,B,C,是不是B里显示所有A选中的项的子项? C也一样?
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<style type="text/css">
body{font-family:Courier New, Courier}
select{font-size:8pt;font-family:Courier New, Courier}
input{font-size:8pt;font-family:Courier New, Courier}
</style>
<SCRIPT LANGUAGE="JavaScript">

</SCRIPT>
</HEAD>

<BODY BGCOLOR="#FFFFFF" onload="onChange(add1.sort,1,'请选择产品中类',sSele,3);onChange(add1.nsort,3,'请选择产品中类',sSele1,3);">
<table width="100%" border="1" cellspacing="0" cellpadding="3" align="center" bordercolorlight="#ECEEE4" bordercolordark="#CCCABC">
  <tr>
    <td width="100%" height="30" colspan="6" align="center" background="images/tablebg.gif"><b>产 品 信 息 管 理</b></td>
  </tr>

  <form action="AddProduct" method="post" enctype="multipart/form-data" name="add1" onSubmit="return check();">
  <input type="hidden" name="id" value="<%=id%>"/>
  <tr>
    <td height="25" align="left">所属类别： 
<select size="1" name="fsort" onChange="javascipt:onChange(add1.sort,this.value,'请选择产品中类',sSele);" >
        <option  value="0">请选择产品大类</option>
                                  <option value = "1"  selected>1 </option>;
                                  <option value = "2" >2 </option>;

      </select>
  <select size="1" name="sort"  onChange="javascipt:onChange(add1.nsort,this.value,'请选择产品小类',sSele1);">
   <option value="0" selected>请选择产品中类</option>
      </select>
  
<select size="1" name="nsort">
   <option value="0" selected>请选择产品小类</option>
      </select>  <span class="style1">*</span></td>
  </tr>
  </form>
</table></BODY>
</HTML>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>无标题文档</title>
</head>
<script>
function an(){
  while(f.s2.length>0){
    f.s2.remove(0);
  }
  //l = f.s2.length ;
  //for (var i=0;i<l;i++){
  //  f.s2.remove(0);
  //}


  if(f.s1.value=="1"){
        newOpt=document.createElement("OPTION");
        newOpt.value="1";
        newOpt.text="1";
        f.s2.add(newOpt);
        newOpt=document.createElement("OPTION");
        newOpt.value="11";
        newOpt.text="11";
        f.s2.add(newOpt);
        newOpt=document.createElement("OPTION");
        newOpt.value="111";
        newOpt.text="111";
        f.s2.add(newOpt);
  }
  if(f.s1.value=="2"){
        newOpt=document.createElement("OPTION");
        newOpt.value="2";
        newOpt.text="2";
        f.s2.add(newOpt);
        newOpt=document.createElement("OPTION");
        newOpt.value="22";
        newOpt.text="22";
        f.s2.add(newOpt);
        newOpt=document.createElement("OPTION");
        newOpt.value="222";
        newOpt.text="222";
        f.s2.add(newOpt);
  }
  if(f.s1.value=="3"){
        newOpt=document.createElement("OPTION");
        newOpt.value="3";
        newOpt.text="3";
        f.s2.add(newOpt);
        newOpt=document.createElement("OPTION");
        newOpt.value="33";
        newOpt.text="33";
        f.s2.add(newOpt);
        newOpt=document.createElement("OPTION");
        newOpt.value="333";
        newOpt.text="333";
        f.s2.add(newOpt);
  }}
</script>
<body>
<form name="f" method="post" action="">
  <select name="s1" onChange = "an()">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
  </select>
  <select name="s2">
  <option value="1">1</option>
  <option value="11">11</option>
  <option value="111">111</option>
  </select>
  <select name="select">
  </select>
</form>
</body>
</html>
http://www.cnblogs.com/xuanye/archive/2007/02/07/642827.html
一个下拉联动控件的实现
<FORM name="isc">
<table border="0" cellspacing="0" cellpadding="0">
  <tr align="center">
    <td nowrap height="11">  <select name="example" size="1" onChange="redirect(this.options.selectedIndex)">
<option selected>---Select1-------------</option>
<option>Webmaster Sites</option>
<option>News Sites</option>
</select><select name="stage2" size="1" onChange="redirect1(this.options.selectedIndex)">
<option value=" " selected> </option>
<option value=" " selected>---Select2--------------</option>
<option value=" " selected>---Select2--------------</option>
</select><select name="stage3" size="1" onChange="redirect2(this.options.selectedIndex)">
<option value=" " selected> </option>
<option value=" " selected>---Select3----------------</option>
<option value=" " selected>---Select3----------------</option>
</select><script>

</script> </td>
  </tr>
</table>
</FORM>