asp判断用户浏览器版本

<%
Dim Agent,Browser,version,tmpstr
Agent=Request.ServerVariables("HTTP_USER_AGENT")
Response.Write(Agent)
Agent=Split(Agent,";")
If InStr(Agent(1),"MSIE")>0 Then
Browser="MS 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
response.Write(""&Browser&"  "&version&"")
%>