Vesbon

I have these short (20) minute videos for my young daughter that I want to backup onto a single DVD. When we go on long car rides it would be nice just to pop in one DVD with 4 or 5 of these short videos instead of having to swap out another movie after just 20 minutes. I created ISO files of each movie, but I can't figure out how to "stack" (queue) them and burn them all to one DVD. Anyone know how to do this with ImgBurn (put a few short videos on a single DVD). Thanks