Support for Local Movie Trailers

Sorry for post on what must be an obvious question, but ..... my Movie collection is managed by MediaCenterMaster.

This has moved my trailers from a "trailer" sub-folder, to the XBMC naming convention of moviename-trailer.avi

The silly question, is how do I actually identify that a movie has a trailer to watch in XBMC?

When I rollover the jacket, I get to see the plot metadata, icons for the audio and video type, the age rating, but I can't find anything obvious for identifying the presence of a local trailer, or the ability to actually watch it.

And then, once I've cracked this - how do I know that it's actually using the local video file, and not downloading from YouTube?

thanks