数据联动显示

表:ANclass

Nclassid  Nclass         classID
3 脚本的应用 3
4 SQL常见查询 3
6 精华帖子          3
7 JSP初级指导 4
8 SQL基础          5
9 数据库管理 5
-----------------------------------
表:Aclass

classID   class
3   ASP专区
4   JSP专区
5   数据库专区
-------------------------------------------
代码:
<%
dim rs
dim sql
dim count
set rs=server.createobject("adodb.recordset")
sql = "select * from ANclass order by Nclassid asc"
rs.open sql,conn,1,1
%>
<script language = "JavaScript">
var onecount;
onecount=0;
subcat = new Array();
        <%
        count = 0
        do while not rs.eof
        %>
subcat[<%=count%>] = new Array("<%= trim(rs("Nclass"))%>","<%= trim(rs("classid"))%>","<%= trim(rs("Nclassid"))%>");
        <%
        count = count + 1
        rs.movenext
        loop
        rs.close
        %>
onecount=<%=count%>;

function changelocation(locationid)
    {
    document.myform.Nclassid.length = 0;
    var locationid=locationid;
    var i;
    for (i=0;i < onecount; i++)
        {
            if (subcat[i][1] == locationid)
            {
      alert(locationid)
      alert("haha");
      //alert(subcat[i][0]);
      alert(subcat[i][2])
      //alert(subcat[i][2]);
                document.myform.Nclassid.options[document.myform.Nclassid.length] = new Option(subcat[i][0], subcat[i][2]);
            }       
        }
       
    }   
</script>
</head>

<body>
<br><br>
<form method="POST" name="myform" action="adminsave.asp?action=add">
  <div align="center"><center><table cellspacing="0" width="80%" border="1" cellpadding="0" cellspacing="0" bordercolor="#999999">
    <tr>
      <td width="100%" bgcolor="#999999" height="20"><font color="#FFFFFF"><center><p><b>添 加 文 章</b></font></td>
    </tr>
    <tr align="center">
      <td width="100%">
 <table border="0" cellspacing="1" width="100%">
         <tr>
                <td width="15%" align="right" valign="top" height="20"><b>文章类型：</b></td>
                <td width="85%">
<%

        sql = "select * from Aclass"
        rs.open sql,conn,1,1
 if rs.eof and rs.bof then
 response.write "请先添加栏目。"
 response.end
 else
%>
<select name="classid" onChange="changelocation(document.myform.classid.options[document.myform.classid.selectedIndex].value)" size="1">
        <option selected value="<%=trim(rs("classid"))%>"><%=trim(rs("class"))%></option>
<%      dim selclass
        selclass=rs("classid")
  response.Write selclass
        rs.movenext
        do while not rs.eof
%>
        <option value="<%=trim(rs("classid"))%>"><%=trim(rs("class"))%></option>
      
<%
        rs.movenext
        loop
 end if
        rs.close
%>
       </select>
   
   <%=selclass%> <select name="Nclassid">                 
<%sql="select * from ANclass where classid="&selclass
rs.open sql,conn,1,1
if not(rs.eof and rs.bof) then
%>
        <option selected value="<%=rs("NclassID")%>"><%=rs("Nclass")%></option>
<% rs.movenext
do while not rs.eof%>
        <option value="<%=rs("NclassID")%>"><%=rs("Nclass")%></option>
<% rs.movenext
loop
end if
        rs.close
        set rs = nothing
        conn.Close
        set conn = nothing
%>
    </select>**
<%response.Write selclass%>  
</td></tr>