6 min movie in mpeg1 format - how to turn it into a loop on dvd?

I can't quite believe I did this, but on Friday I accidentally gave away our only copy of a DVD edited with quick cuts, to play for people who only glance for a couple of seconds - at a conference exhibition.
So I realized late Friday, and it has to be playing for mid-Tuesday.
I can't get back the original by then.

So I'm looking at alternatives.
I figure the best I can do is get the long, story version of it, which is 6 minutes and I have it only on CD ROM now, and figure out how to play it on a loop. It will be playing on a TV with DVD player, so I can't just select loop on a laptop's DVD player.
I'm having trouble.
First I imported to iDVD, but there was no audio. I sorted through help and figured out that my 6 min. video is in MPEG1, and iDVD will only transfer the video from that format (won't transfer the audio_. It told me to import with iMovie instead of iDVD. So I did, and saved in iMovie, still is in Mpeg format. iMovie wouldn't let me do any editing, nor would iDVD when I tried copying it over there. So I then saved it to the blank DVD. But no looping.

Two questions

- I can't figure out how to get it to loop - endlessly, or at least for 3 or 4 hours. Loop seems to be a function in iDVD only. It saved automatically in Quicktime format... I don't have Quicktime Pro, so don't have access to editing in that program.
- What problems will I run into with the original being CDrom format, and my output being DVD? Will I lose a lot of quality? Will it only play on my drive which plays CDrom or DVD, or will it play on a DVD player hooked up to a DVD?

Thx
Lisa