高手们我都不行了,实在条不出来了,请指点!!!

我做的产品类型添加,编辑和删除都出错了,急呀!!!
删除时的错误:
错误类型：
Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
[Microsoft][ODBC Microsoft Access Driver] 无法从指定的数据表中删除。
/products/admin/category.asp, 第 27 行
添加时的错误:
错误类型：
Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
[Microsoft][ODBC Microsoft Access Driver] 操作必须使用一个可更新的查询。
/products/admin/category.asp, 第 68 行
编辑时的错误:
错误类型：
Microsoft OLE DB Provider for ODBC Drivers (0x80004005)
[Microsoft][ODBC Microsoft Access Driver] 操作必须使用一个可更新的查询。
/products/admin/category.asp, 第 100 行


我的删除,添加和编辑都在CATEGORY.ASP里,代码如下:
<%@ Language=VBScript %>
<% option explicit %>
<!--#include file="conn.asp"-->
<!--#include file="../style.asp"-->
<!--#include file="chkadmin.asp"-->
<%
dim curaction, curid,curpage, bedit, founderr, errmsg

if request("page")="" then
curpage = 1
else
curpage = cint(request("page"))
end if

curaction = request("action")
curid = request("id")
bedit = false
founderr = false
if curaction = "edit" then
bedit = true
end if

dim sql
'删除记录
if curaction = "delete" then
sql = "DELETE FROM category WHERE id=" + cstr(curid)
conn.execute sql '第27行
sql = "delete from news where cateid=" + cstr(curid)
conn.execute sql
if err.number <> 0 then
response.write "数据库操作错误：" + err.description
err.clear
else
response.write "记录已经删除。"
end if
%>
<script>
top.menu.location.reload()
</script>
<%
end if

'添加记录
if curaction = "newsave" then
if trim(request("txttitle")) = "" then
founderr = true
errmsg = "<p>请输入产品类别！</p>"
end if
if trim(request("en_txttitle")) = "" then
founderr = true
errmsg = "<p>请输入产品类别英文名称！</p>"
end if
sql="select * from category where title='" & request("txttitle") & "'"
set rs=server.createobject("adodb.recordset")
rs.open sql,conn,1,1
if rs.recordcount > 0 then
founderr=true
errmsg = errmsg & "<p>该类别已经存在!</p>"
end if
rs.close
if founderr then
response.write errmsg
else
sql = "insert into category(title,en_title,class_id) values('"
sql = sql + cstr(request("txttitle")) + "','" + cstr(request("en_txttitle")) + "','" + request("class") + "')"
'response.write sql
'response.end
conn.execute sql '第68行
if err.number <> 0 then
response.write "无法保存,数据库操作出错:" + err.description
else
response.write "记录已经添加到数据库。"
end if
end if
%>
<script>
top.menu.location.reload()
</script>
<%
end if

'保存记录
if curaction = "editsave" then
if trim(request("txttitle")) = "" then
founderr = true
errmsg = "<p>请输入产品类别！</p>"
end if
if trim(request("en_txttitle")) = "" then
founderr = true
errmsg = "<p>请输入产品类别英文名称！</p>"
end if
if founderr then
response.write errmsg
else
sql = "UPDATE category SET "
sql = sql + "title='" + htmlencode(request("txttitle")) + "',"
sql = sql + "en_title='" + htmlencode(request("en_txttitle")) + "',"
sql = sql + " class_id = " + request("class")
sql = sql + " WHERE id = " + cstr(curid)
conn.execute sql '第100行
if err.number <> 0 then
response.write "无法保存,数据库操作出错:" + err.description
else
response.write "记录已经更新到数据库。"
end if
end if

end if
%>
'下面的是接着的