卡尔加里气候:asp出错了，求助

本来大类的改变，小类也应该变的，可是不知道是怎么会事，怎么不对了，希望大家能帮帮我。

http://www.xiang8.com/boardsearch.asp?key=影视

部分代码：

<SCRIPT language="javascript">
function changelocation(locationid)
{
document.form.BoardClass.length = 0;

var locationid=locationid;
var i;
for (i=0;i < onecount; i++)
{
if (subcat[i][1] == locationid)
{
document.form.BoardClass.options[document.form.BoardClass.length] = new Option(subcat[i][0], subcat[i][2]);
}
}

}
</SCRIPT>

...

<TD width="10%" height="30" align="left" class=INDEX_XMALL>所属大类：</td>
<TD height="30" colspan="2">
<SELECT name="BoardNlass" onChange="changelocation(document.form.BoardNlass.options[document.form.BoardNlass.selectedIndex].value)" size="1">
<%
set rs=server.createobject("adodb.recordset")
sql = "select * from QiQiBoy_Nlass_Disp"
rs.open sql,conn,1,1
if rs.eof and rs.bof then
response.write "..."
response.end
else
%>
<OPTION selected value>==请选择大类==</OPTION>
<%do while not rs.eof%>
<OPTION value="<%=trim(rs("BoardNlass"))%>"><%=trim(rs("BoardNlassName"))%></OPTION>
<%
rs.movenext
loop
end if
rs.close
set rs=nothing
%></SELECT>
</TD>
<TD width="0%" height="30"></TD></TR>
<TR>
<TD width="8%" height="30"></TD>
<TD width="10%" height="30" align="left" class=INDEX_XMALL>所属小类：</td>
<TD height="30" colspan="2"><SELECT name="BoardClass"><OPTION selected value>==请选择小类==</OPTION></SELECT></TD>
<TD width="0%" height="30"></TD></TR>
<TR>