Msg Box On Close Only If In Edit Mode

I have a form that is locked unless they click the command button to edit records. I want a msg box that when they click the close button it pops up with something like save edits? Just as an extra precaution. But I only want the message box to pop up if the form is in edit mode. Is this possible? And I would like to be able to have them click ok or cancel in the message box

Here is the code for the close button:

Private Sub Close_Click()
On Error GoTo Err_Close_Click


DoCmd.Close

Exit_Close_Click:
Exit Sub

Err_Close_Click:
MsgBox Err.Description
Resume Exit_Close_Click

End Sub

Thanks

Tracy