Control/unload swf inside html textfield i AS3

Hi,
In a CS3/As3 project I have xml files with html content loaded in a texfiled inside a mc. In some cases I have swf files embedded with img tag in the xml. The problem is that when a swf is loaded this way It keeps 'living', playing with sounds in the background when other xml files and swf are loaded in the texfiled.
Then, every time it is loaded, a new instance of the swf is created and played.
I have found out you can refer to the loader object with getImageReference method giving an id to img tag and, for example, adding an Event.COMPLETE listener to the loader.
But I don't know how to access to the loaded swf to unload it or at least stop it (mc_name.texfiled_name.swf_id doesn't seem to work in AS3)
Does anybody know if it is possible?
Thanks in advance

Thank you, the second method is good to control movieclip in my case (fp9).
But I have still the following problem: the loaded objects (swf or images) seem to remain in memory.
I have a loader like this (swf_Id is the id of img tag)
loader = myMC.MyHtmlTextField.getImageReference("swf_Id");
and, following your indication, a second Mc like this
myMC2=MovieClip(loader.content);
doing the following things seem to remove the objects from stage but with no effects on the memory wich always increases
myMC2.removeChildAt(0);
myMC2=null;
loader.unload();
Any idea about this?
Thanks a lot!

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Control/unload swf inside html textfield i AS3

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