ASP传参失败？

A.asp:
 <!----------------------------------产品中心开始----------------------------------->
<form ID="form2" name="form2" method="post" action="">   
   <td wIDth="238" rowspan="3" valign="top">   
 <% Set rs = Server.CreateObject "ADODB.Recordset")   
 sql= "select * from product order by ID "   
  rs.open sql,conn,1,3 rs.movefirst     %>   
<%dim flaga     flaga=rs("ID") %>  
 <%do while not rs.eof or rs.bof%>      
  <img src="<%=rs("photoadd")%>" width="129" height="81" border="0">
<%response.write " <a href ='productDetail.asp?flaga="&flaga&"' Target=_blank >详细信息</a>"%></img><%flaga=flaga+1%><%rs.movenext%><%loop%>    <br>  
  </td></form>
 b.asp
     <!--#include file="conn.asp"-->
     
     <%
     dim flaga
         flaga=request.form("flaga")
     Set rs = Server.CreateObject("ADODB.Recordset")
     sql= "select * from product"
     rs.open sql,conn,1,1
     rs.movefirst
     %>
        <%if not rs.eof or rs.bof then%>
        
        <img src="<%=rs("photoadd")%>" width="500" height="300" border="0"></img>
        <%response.Write(rs("productNameCH"))%>
        <%end if%>
打开b.asp，每个连接显示的都是id=1的内容