<!-- Masterpage -->
  <form id="form1" runat="server">
   <%=Master_HTML(0)%>
   <asp:contentplaceholder id='Contentplaceholder1' runat="server" />
   <%=Master_HTML(1)%>
   <asp:contentplaceholder id='Contentplaceholder2' runat="server" />
   <%=Master_HTML(2)%>
   <asp:contentplaceholder id='Contentplaceholder3' runat="server" />
   <%=Master_HTML(3)%>
   <asp:contentplaceholder id='Contentplaceholder4' runat="server" />
   <%=Master_HTML(4)%>
  </form>

    Public Master_HTML() As String
    Protected Sub Page_PreInit(ByVal sender As Object, ByVal e As _
      System.EventArgs)
        Master_HTML = Split(Session("Master"), "<asp:contentplaceholder id=")
        For I = 0 To UBound(Master_HTML) - 1
            If I = 1 Then
                Contentplaceholder1.ID = Left(Master_HTML(I), InStr(Master_HTML( _
                  I), Chr(34)) - 1)
            ElseIf I = 2 Then
                Contentplaceholder2.ID = Left(Master_HTML(I), InStr(Master_HTML( _
                  I), Chr(34)) - 1)
            ElseIf I = 3 Then
                Contentplaceholder3.ID = Left(Master_HTML(I), InStr(Master_HTML( _
                  I), Chr(34)) - 1)
            ElseIf I = 4 Then
                Contentplaceholder4.ID = Left(Master_HTML(I), InStr(Master_HTML( _
                  I), Chr(34)) - 1)
            End If
            If I > 0 Then
                Master_HTML(I) = Right(Master_HTML(I), Len(Master_HTML(I)) - _
                  InStr(Master_HTML(I), "</asp:contentplaceholder>") - 24)
            End If
        Next I
 
    End Sub

Joachim