Flash grinding to a halt because is not unloading media

hi guys,
i've a got a huge (relatively) problem ni that i've created a Flash app with a dynamic data structure which ends in 150 different nodes.
each node (if visited) loads in between 5-10 images and a couple of movies.
The data for each node and its consequent external media are all displayed in the same visual class that is only instantiated once.
The display object that contains the jpgs and movies is cleared of all child objects before the next node loaded.
Yet the size of the flash file (according to windows task manager) never shrinks and very soon reaches 1mb in size at which point it starts to chuc badly.
It's my understanding - even though i'm using 'removeChild' on each object and resetting any references to the said child objects - that they are not being removed from teh cached memory and for whatever reason not being picked up/emptied by the garbage collector?
Does this sound about right?
If so, can anyone suggest HOW i can make it so that the loaded media is removed from memory when it is element is removed (removeChild etc)
All help greatly recieved as this project is due to be delivered later this week!
regards, Rich
Ps. running on Windows XP SP3, Firefox, FlashPlayer 10, Flash CS4 published for Flash player 9, written in AS3, all external meia is *.jpg and *.flv

hmm, good article which makes sense.
i'm using removing the container from the stage using removeChildAt()
and then reseting the array that stored the references to the items that were within the container.
there don't seem to be any other references, the loaded objects are not referenced or passed around outside of the container
if you can't force garbage collection can you adjust the threshhold or what triggers it.
I am, at this stage, unsure whether the items are marked for collection but it isn't firing or it it's firing but they're somehow (as you say - likely through being referenced) not being marked.
is there any way to track an objects reference count?

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