How to use several Background Images simultaneously for reference?

BlenderWiki seems to indicate that you can use several background images simulataneously (‘by default, there is only space space for one image’):
http://wiki.blender.org/index.php/Doc:2.6/Manual/3D_interaction/Navigating/3D_View_Options

So how do you use several jpeg’s in the same project in order to show one for FRONT VIEW and another for BACK VIEW, etc.?

Oh, I got it now:

After you’ve imported one image, a new ‘Not set’ box appears - allowing you to add a new image.

Press the Add Image button http://cgcookie.com/blender/2010/03/15/using-multiple-background-images-in-2-5/

Can also use image empties

Background images have one negative side, when you rotate your view, you cant see image. If you need to see that, use post #4 or Add/Import Images as planes.