Digital Video Enconding - square pixel vs non square pixel

[arte.di...@gmail.com]

Hello, I am encoding Digital Video (720x576 DV-PAL, 25 fps, Pixel
Aspect Ratio 1,067, Pixel Depth 32 Bit) which is the video I
digitalized directly from the DV camera (miniDV) with Adobe Premiere
Pro. I am now converting the footage to be used in the Internet (Flash
Video .flv and mp4 .H264).
I finalize the editing and have now the final videos ready to put in
the Internet. My question is:
Do I have to conform Pixel Aspect Ratio (of the edit videos) to square
pixel?
I haven't done this and I converted the videos to .flv using Riva FLV
Enconder and/or Flix Pro. The results are acceptable and can always
increase the quality by increasing the video bitrate. But I have been
reading that the videos used on the internet (to be displayed on
computer monitors) must use square pixels. Do I have to concern with
this? If yes, how can I encode the videos for the web in the right
way?

note: after enconding to .flv the Sample Aspect Ratio (SAR) = 1,250
(5:4)