ASP中怎样用Request.ServerVariables获取访客的系统版本和IE版本

<%
Function Browser(Info)
Info=Request.ServerVariables("Http_User_Agent") '在这里初始化了Info,在实际应用中可以作为其他变量赋值
If InStr(Info,"MSIE 6")>0 Then
Browser="Internet Explorer 6.0"
ElseIf InStr(Info,"MSIE 5.5")>0 Then
Browser="Internet Explorer 5.5"
ElseIf InStr(Info,"MSIE 5.0")>0 Then
Browser="Internet Explorer 5.0"
ElseIf InStr(Info,"MSIE 4")>0 Then
Browser="Internet Explorer 4.0"
Else
Browser="未知的浏览器!"
End if
Response.Write "您的浏览器是:"&Browser&"<p>"
End Function

Function System(Info)
Info=Request.ServerVariables("Http_User_Agent")
If InStr(Info,"NT 5.1")>0 Then
System="Windows XP"
ElseIf InStr(Info,"NT 5.0")>0 Then
System="Windows 2000"
ElseIf InStr(Info,"NT