asp判断浏览器类型并显示不同网页

<%
Dim BrowserString
BrowserString = Request.ServerVariables("HTTP_USER_AGENT")
BrowserString = Lcase(BrowserString)

Dim broFirefox,broMSIE,broOpera,broWap
broFirefox = "firefox"
broMSIE = "msie"
broOpera = "opera"
broWap = "wap"

'如果是Firefox
if Instr(BrowserString, broFirefox) <> 0 then
Response.Redirect(broFirefox & ".asp")
end if
'如果是MSIE
if Instr(BrowserString, broMSIE) <> 0 then
Response.Redirect(broMSIE & ".asp")
end if
'如果是Opera
if Instr(BrowserString, broOpera) <> 0 then
Response.Redirect(broOpera & ".asp")
end if
'如果是Wap（没有用过所以还要看HTTP_USER_AGENT表示的结果）
if Instr(BrowserString, broWap) <> 0 then
Response.Redirect(broWap & ".asp")
end if
%>