我想把&Document.All.UserName.Value这个列表框的值form传递

我想把 & Document.All.UserName.Value 这个列表框的值 
通过form表单提交的方式传递给 chklogin2.asp
也就是 这个Chklogin2.Asp?usermingzi='hello">[/里的 怎么写才能传过去啊？
<form name="form" method="post" action="Chklogin2.Asp?usermingzi='hello">
                <tr>
                  <td width="97%"><table width="100%"  border="0" cellspacing="0" cellpadding="0">
                    <tr>
                      <td width="35%" height="25" align="right">支 局：</td>
                      <td width="65%" height="25">
                        <select name="UserName" id="UserName" OnChange='VBScript:ChangType' >
<%
    set rs=server.createobject("adodb.recordset") 
     sql= "select * from userbiao "
    rs.open sql,conn,1,1 
    if rs.bof and rs.eof then
    %>
    <%else%>
    <%do while not rs.eof%>
      <option value="<%=rs("username")%>"><%=rs("username")%></option>
       <%i=i+1        
      if i>=100000 then exit do
      rs.movenext
      loop 
      rs.close   
      set rs=nothing 
      end if  
      conn.close
      set conn=nothing    
     %> 
    </select>  </td>
                    </tr>
<tr>
                      <td height="25" align="right">名  &nbsp;称：</td>
                      <td height="25">
                       <P><IFRAME HEIGHT="22" WIDTH="220" FRAMEBORDER=NO MARGINHEIGHT=0 SRC="BB.asp?IDD='孙波'" ID="TitleFrame"></IFRAME></P>                    </td>
                    </tr>
<tr>
                      <td height="25" align="right">密  &nbsp;码：</td>
                      <td height="25">
                        <input name="Password"  type="password" maxlength="20" class="logininput">                      </td>
                    </tr>
                    
                    <tr>
                      <td height="25" align="right">验证码：</td>
                      <td height="25">
                        <input name="verifycode" size="4" maxlength="4">
                        <% = GetCode() %></td>
                    </tr>
                    <tr>
                      <td height="25" align="right"></td>
                      <td height="25"><input type=submit name=submit value="Login">&nbsp;&nbsp;&nbsp;<input name="reset" type="reset"  id="reset" value="Reset"></form>