Preloader till a certain frame

Hi,
I am creating a game that has many levels. I'm scared that by the end, the file size will be too big (although I'm not using HQ pictures or...).

Could I for example load or preload the flash file level by level?

Let's say the first level is at frame 55. So when the game starts the flash will preload till frame 55 and when the level is accomplished, it will load till let's say 75. That way it will load bit by bit and won't load the WHOLE probably 2 MB thing...

Any help? Or any other similar thing I could do?