Dave,

The interface of LE is pretty much the same as Premiere Elements V1 as far as I can remember. Click below to see a screenshot.

http://desktopvideo.about.com/od/ado.../> crn_RO.htm

I checked it out, Premiere Elements V1 has a horizontal flip effect which does exactly as you describe. It's under - Video Effects - Transform - Horizontal Flip.

Hope this helps

Matty