Nautilus missing sidebar, address bar

[Steven Stern]

My Nautilus windows are missing the sidebar and address bar as well as 
the options to turn them on/off from the VIEW menu.  The help system says:

You can show and hide file browser window components as follows:

To hide the side pane, choose View-> Side Pane. To display the side pane 
again, choose View -> Side Pane again.
To hide the toolbar, choose View -> Toolbar. To display the toolbar 
again, choose View -> Toolbar again.
To hide the location bar, choose View -> Location Bar. To display the 
location bar again, choose View -> Location Bar again.
To hide the statusbar, choose View -> Statusbar. To display the 
statusbar again, choose View -> Statusbar again

but there are no such items on the View menu.

I don't know how they got removed. How do I get them back?
-- 

   Steve