Msg Box Before Macro Start

Hello,

I have a button that runs a macro to delete records in 12 tables. I want to create a message box before that macro runs warning that you are deleting records in 12 tables and are your sure you want to run the macro.

I need a message box with an ok and cancel button. Where do I put the msgbox funtion in this code?

Thanks !!

This is my code:

Private Sub cmdRunDeleteMacro_Click()
On Error GoTo Err_cmdRunDeleteMacro_Click

Dim stDocName As String

stDocName = "mcrSemesterStartRecordDELETE"
DoCmd.RunMacro stDocName

Exit_cmdRunDeleteMacro_Click:
Exit Sub

Err_cmdRunDeleteMacro_Click:
MsgBox Err.Description
Resume Exit_cmdRunDeleteMacro_Click

End Sub