added play_video_6 and renamed playVideo to playVideo_4. PV4 is the only
one that works at the moment. 
Also pointed to the videos on the localhost apache2 server. 
Still trying to figure out how the code handles the different formats or
doesn't as the case may be.
updated the mp4Experiment filename to VID_mp4Experiment.mp4 so it is
lexically in order with the rest of the videos
worked on play 5 and play 6
added play 7
added video 8 and video 9