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I wanted to add an id to the swfobject wrapper so I used:
$args = array( ... 'othervars' => array( 'id'=>'home-flash', ... ) ... );
It "worked" by making 'swf-home-flash' the id of the swftools-wrapper div but it also added the plain text id="home-flash" in the params area. This made the text appear above the flash object when it was rendered.