Embedded FLV problem

I am making about 100 swf (quizzes) including embedded FLVs and a viewer that navigates between them using Next and Previous buttons

When I load swf as a child, I remove the old swf using the following code

SoundMixer.stopAll();
if(loader != null)
{
if(stage.contains(loader))
{
removeChild(loader);
}
loader.unloadAndStop();
loader = null;
}
loader = new Loader();
loader.x=0;
loader.y=0;
loader.load(new URLRequest("L4/C/" + shuffledLetters1[currentPage1] + ".swf"));
addChild(loader);

The problem is, if I am clicking buttons quickly, more than embedded video are working together, just videos not the whole swf. How can I remove videos also as I removed swfs themselves?