LotusScript equivalents for the @URLDecode

Function urlDecode(s As String) As String
If Len(s) = 0 Then Exit Function
Dim i As Integer
Dim tmp As String
Dim c As String
For i = 1 To Len(s)
c = Mid$(s, i, 1)
If c = "+" Then c = " "
If c = "%" Then
c = Chr$("&H" + Mid$(s, i + 1, 2))
i = i + 2
End If
tmp = tmp + c
Next i
urlDecode = tmp
End Function