Merging 2 Images 2 One Image For Burning

hey guys…i have a couple of movies that are kinda old and use the side a, side b thing with a single layer dvd. i normally use dvdd to make an image of the movie then burn with image burn. with such titles as goodfellas, and sleepers there are 2 images. what do i need to do to burn these images on one dl disc and have it play the whole movie without stopping? thanks in advance.

oh yeah i forgot to mention i dont compress or anything like that…just want a 1:1 copy to a dl disc.