asp乱码问题

最近惹上令人头疼的中文乱码，望高人指点一二
整体网站采用gb2312编码

函数页面：
<%Session.CodePage=936
response.Charset="gb2312"
%><%
function dropDownList(list,selectedID,name,tag)
'TODO:验证list为二维数组
'ResponseWrite "list",list
Response.Write "<select name='"&name&"' id='"&name&"'>"
if(tag<>0) then
dim wu
wu="无" '此处便出现乱码
Response.Write "<option value=''& selected>"&wu&"</option>" '直接在此处写入中文也是乱码
end if
for j=0 to Ubound(list,2)
If Cint(list(0,j))=selectedID Then
Response.Write "<option value='"&list(0,j)&"'& selected>"&list(1,j)&"</option>"
Else
Response.Write "<option value='"&list(0,j)&"'>"&list(1,j)&"</option>"
End if
next
Response.Write "<select>"
End function
%>
调用函数的页面是在iframe中,且已标明了
<%@CodePage=936%>
<%Session.codePage=936
response.charset="gb2312"%>

母版也标明了以上代码

---

response.charset="gb2312"改为下边的

Response.Addheader "Content-Type","text/html; charset=gb2312"
{{----}