<%
...
if session("number")="" then session("number")=3
username=request.form("username")
password=request.form("password")
set rs=conn.execute("select * from [user] where username='"&username&"' and password='"&password&"'")
if rs.eof and rs.bof then
session("number")=session("number")-1
response.write "你还有"&session("number")&"次机会"
'返回上一页
else
response.write "登陆成功"
end if
...
%>