compile error Ambiguous name detected

Sun, 12 Jul 2009 19:02:25 Z

compile error
Ambiguous name detected: Left

The code stops in a private procudure and highlights Left$

Public Sub remove_letter2()

    Dim alpha(1 To 26) As Integer
    Dim x As Integer
    Dim f As Form

    Set f = Screen.ActiveForm

    For x = 1 To 26
        alpha(x) = 0
    Next x
    With rs_Client
        .MoveFirst
        Do Until .EOF
            alpha(Asc(Left$(!Surname, 1)) - 64) = 1
            .MoveNext
        Loop
    End With
    For x = 1 To 26
        If alpha(x) = 0 Then
           f("toggle" & (x + 9)).Visible = False
        End If
    Next x

End Sub

compile error Ambiguous name detected

Sun, 12 Jul 2009 22:36:13 Z

Searching other posts it seems to be a name confliction which is why i've named this function remove_letter2 instead of remove_letter. I have used the remove_letter function in some other forms and the only other lefts are;

If VBA.Mid(strInput, Len(strInput) - 2, 1) = "O" Then strInput = _
            Left(strInput, Len(strInput) - 3) & "0" & VBA.Right(strInput, 2)

Case 6
            If RgExp.test(Left(strInput, 3) & " " & VBA.Right(strInput, 3)) = True Then
                 txtPostcode = Left(strInput, 3) & " " & VBA.Right(strInput, 3)
            Else
                Exit Function
            End If

.TypeParagraph
        .ParagraphFormat.Alignment = wdAlignParagraphLeft
        .TypeParagraph

Payments.ClientNo FROM Client LEFT JOIN Payments ON Client.ClientNo