You can also do:
Sub Hide()
Sheet1.Visible = xlHidden (or xlveryhidden) if you don't want the user to be able to see it at all.
Sheet2.Visible = xlHidden (or xlveryhidden) if you don't want the user to be able to see it at all.
End Sub
Sub Unhide()
Sheet1.Visible = True
Sheet2.Visible = True
End Sub