Burning avi to dvd

Please help me. My boyfriend is trying to burn dvds and we are both kinda illiterate when it comes to that stuff. What we need to know is how would you get more than one movie per dvd. They are avi files and we are trying to convert them to dvd extended play but he can’t seem to figure out how. PLEASE HELP US.

What are the sizes of these avi files? Do you know if your stand alone DVD player supports Divx? If they are large files, 700MB i.e., and you are converting them to standard DVD format, chances are you won’t get more than one or two on a single SL DVD. What program/s are you using now to convert them? What program are you using to burn? What type of blank disks are you using?