Get free/used memory info

I'm writing code for a system that is very limited in it's memory. I've written some code to cache the data and movieclips used, but eventually I'll need to free some memory before I run out (and flash is terminated)
Is there a way to find out
- how much memory flash/my .swf is using in total?
- how much memory is free?
- how much memory an object or movieclip (including it's children) occupy?
I'm looking for something to decide wether or not I should release some memory. it doesn't need to be very precise, just anything I can use as an indicator in actionscript 2.0
I've found that in Flash Lite I can use
Code:
fscommand2("GetTotalPlayerMemory")
fscommand2("GetFreePlayerMemory");
but unfortunately I'm not using Flash Lite and these commands don't seem to exist in flash 7+.
Is there anything I could use?

The application is much like a browser: Pages (with text, images and some interactive elements) are defined on a server. The swf renders these pages and lets you navigate them.
When enough memory is available I can keep previous pages in memory, so revisiting a pages and reusing images does not require them to be reloaded (which can take more than 10 seconds for a complex page).
When memory is low, pages (except the current page) can be removed from the cache and they'll have to be reloaded when the user revisits them.
If I do not remove old pages/images from memory, eventually there will be a moment the swf runs out of memory and is killed. But if I remove pages too soon, revisiting them will be a wait. We've already seen situation where I can hold only 3 pages in memory simultaniously. It depends on the complexity of the page and the availablity of memory. As long as there is enough memory for 1 page, it'll work.
Basically I want to do as much caching as possible. The problem is finding out how much is possible.

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