判斷訪問是否來自搜索引擎的ASP函數

<%
'檢查當前用戶是否是蜘蛛人
Function check(user_agent)
    allow_agent=split("Baiduspider,Scooter,ia_archiver,Googlebot,FAST-WebCrawler,MSNBOT,Slurp",",")
    check_agent=false
    For agenti=lbound(allow_agent) to ubound(allow_agent)
        If instr(user_agent,allow_agent(agenti))>0 then
            check_agent=true
            exit for
        end if
    Next
    check=check_agent
End function
user_agent=Request.ServerVariables("HTTP_USER_AGENT")
'check(user_agent)=true則判定訪問為蜘蛛人
%>

注：本函數來源於網上，是否可用有待驗證！