asp 判断是否为搜索引擎蜘蛛的代码

<%
function GetBot()
'查询蜘蛛
dim s_agent
GetBot=""
s_agent=Request.ServerVariables("HTTP_USER_AGENT") ‘关键判断语句
if instr(1,s_agent,"googlebot",1) >0 then
GetBot="google"
end if
if instr(1,s_agent,"msnbot",1) >0 then
GetBot="MSN"
end if
if instr(1,s_agent,"slurp",1) >0 then
GetBot="Yahoo"
end if
if instr(1,s_agent,"baiduspider",1) >0 then
GetBot="baidu"
end if
if instr(1,s_agent,"sohu-search",1) >0 then
GetBot="Sohu"
end if
if instr(1,s_agent,"lycos",1) >0 then
GetBot="Lycos"
end if
if instr(1,s_agent,"robozilla",1) >0 then
GetBot="Robozilla"
end if
end function
if GetBot="baidu" then
'给百度定制的内容
elseif GetBot="google" then
'给google 定制的内容
end if
%>

Class SystemInfo_Cls
Public Browser, version, platform, IsSearch, AlexaToolbar
Private Sub Class_Initialize()
Dim Agent, Tmpstr
IsSearch = False
If Not IsEmpty(Session("SystemInfo_Cls")) Then
Tmpstr = Split(Session("SystemInfo_Cls"), "|||")
Browser = Tmpstr(0)
version = Tmpstr(1)
platform = Tmpstr(2)
AlexaToolbar = Tmpstr(4)
If Tmpstr(3) = "1" Then
IsSearch = True
End If
Exit Sub
End If
Browser = "unknown"
version = "unknown"
platform = "unknown"
Agent = Request.ServerVariables("HTTP_USER_AGENT")
If InStr(Agent, "Alexa Toolbar") > 0 Then
AlexaToolbar = "YES"
Else
AlexaToolbar = "NO"
End If
If Left(Agent, 7) = "Mozilla" Then '有此标识为浏览器
Agent = Split(Agent, ";")
If InStr(Agent(1), "MSIE") > 0 Then
Browser = "Internet Explorer "
version = Trim(Left(Replace(Agent(1), "MSIE", ""), 6))
ElseIf InStr(Agent(4), "Netscape") > 0 Then
Browser = "Netscape "
Tmpstr = Split(Agent(4), "/")
version = Tmpstr(UBound(Tmpstr))
ElseIf InStr(Agent(4), "rv:") > 0 Then
Browser = "Mozilla "
Tmpstr = Split(Agent(4), ":")
version = Tmpstr(UBound(Tmpstr))
If InStr(version, ")") > 0 Then
Tmpstr = Split(version, ")")
version = Tmpstr(0)
End If
End If
If InStr(Agent(2), "NT 5.2") > 0 Then
platform = "Windows 2003"
ElseIf InStr(Agent(2), "Windows CE") > 0 Then
platform = "Windows CE"
ElseIf InStr(Agent(2), "NT 5.1") > 0 Then
platform = "Windows XP"
ElseIf InStr(Agent(2), "NT 4.0") > 0 Then