How do Control a Streaming Dynamic External SWF

Alright So here is the problem… I am building a flash media player which you can visit at this address

http://www.drakewire.com/ad1.html

Everything loads fine, at least in concept…

However, on Frame one I am calling an external SWF file which is dynamic meaning it changes everyhour, as do the advertisements that play before.

Some ads are 15 seconds, some are 10 Seconds, after the video ad is done rolling, I need to load a new movie which I have also done successfully.

However,
my issue is that the original file that gets loaded on frame 1 of the movie has its own buffer controls, where it loads per browser at different streaming rates, and my movie file is loading this file into the timeline and I am unloading it at exactly 15 Seconds, regardless of whether or not the original advertisement has actually loaded… Is there a way to ensure that the file loads and or streams for 15 seconds and then gets unloaded to load the next movie?