asp获取当前页面url

<%
Function GetLocationURL()
Dim Url
Dim ServerPort,ServerName,ScriptName,QueryString
ServerName = Request.ServerVariables("SERVER_NAME")
ServerPort = Request.ServerVariables("SERVER_PORT")
ScriptName = Request.ServerVariables("SCRIPT_NAME")
QueryString = Request.ServerVariables("QUERY_STRING")
Url="http://"&ServerName
If ServerPort <> "80" Then Url = Url & ":" & ServerPort
Url=Url&ScriptName
If QueryString <>"" Then Url=Url&"?"& QueryString
GetLocationURL=Url
End Function
Response.Write GetLocationURL()

%>

function getcenter(str,a,b)'str是字符串
 getcenter=split(split(str,a)(1),b)(0)
end function

Response.Write getcenter(GetLocationURL(),"=","")