asp防刷新程序

Public Sub PreventRefresh()
  Dim RefreshTime
  RefreshTime = 20
  If DateDiff("s", Session("UserRefreshTime"), Now()) < RefreshTime Then
   FoundErr = True
   Response.Write "<META http-equiv=Content-Type content=text/html; chaRset=gb2312><meta HTTP-EQUIV=REFRESH CONTENT=" & RefreshTime & "><br>本页面起用了防刷新机制，请不要在" & RefreshTime & "秒内连续刷新本页面<BR>正在打开页面，请稍后……"
   Response.end
  End If
 End Sub