わかりました。すべてのブラウザでテスト済み。IE6 用の P3P タグを追加しましたが、必要かどうかは不明です。
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Response.AddHeader("P3P", "CP=""CAO PSA OUR""")
Dim passedlocalizeID As String = Request.QueryString("id")
Dim localizeID As Integer
If passedlocalizeID IsNot Nothing AndAlso Int32.TryParse(passedlocalizeID, localizeID) Then
Dim localizer As New Localizer
localizer.LocalizeTo(localizeID)
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Redirecting . . .</title>
<meta http-equiv="refresh" content="0;URL=/" />
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
</form>
</body>
</html>