Sorry for bad quality (especially the sound doesn't match the video in later part of the movie. But i'm not videoeditor and tried twice to fix it - always with the same result with video delay). But even watching video without sound you should learn new tricks and learn how to make new button.
1. You will need:
GIMP - http://www.gimp.org/
GIMP DDS plugin - http://nifelheim.dyndns.org/~cocidius/dds/
Buttonmaker - http://forums.civfanatics.com/downloads.php?do=file&id=3994
and of course image you want to turn into the button.
2. To watch video you need to have software for watching videos (It could be standard Windows Media Player) + xvid codeck - http://www.xvidmovies.com/codec/
Making Button for CIV4 in GIMP [Videotutorial] 2016-10-05
Making Button for CIV4 in GIMP [Videotutorial]