video covers

I am pretty new to xbmc so go easy with me if this has been answered b4.

I have got a pivos with xbmc linux version running, and all is well.

But i have got a usb hard drive connected with a folder of all my comedy mkv's, approx 20 of them, within that folder i have got a jpeg of each of the mkvs, with the same file name but .jpg

What i want to do is, when i am on the main menu and go to videos, i want all my videos showing on the main screen above like a slideshow, but i have know idea how to do this, i know i can use one of the scrappers but it brings the wrong images on most of them, is there a way i could just use my own pictures for each mkv.

Hope you understand what i am trying to do.

Thanks in advance