Newbie zoom question (yes, again, I know)

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Ok,

   So for the sake of my learning the arcane art of actionscript I am 
trying to create a zoom effect. I really would not like to use a button 
but I can seem to make this OnClipEvent() business work. I have to 
admit that I am still fuzzy on when to use nextFrame() calls. I have 
version 0.2a of ming along side PHP 4.3 on Debian Linux. At last, the 
ugly test code.

<?php

ming_useswfversion(5);

$circle = new SWFShape();
$circle->setRightFill($circle->addFill(0,255,34));
$circle->setLine(.75,255,0,0);
$circle->drawcircle(2);
$as_zoom = "
         mouse = _xmouse;
         if (mouse<0) {
                 mouse = -1*mouse;
         }
         scale = 200 - mouse;
         if (scale<100) {
                 scale = 100;
         }
         if (scale>200) {
                 scale = 200;
         }
         setProperty(\"\",_xscale, scale);
         setProperty(\"\",_yscale, scale);
";

$sprite = new SWFSprite();
$sh = $sprite->add($circle);
$sprite->nextFrame();


$m=new SWFMovie();
$m->setdimension(800,600);
$m->setrate(60);
$ch = $m->add($sprite);
$ch->addAction(new SWFAction($as_zoom), SWFACTION_ENTERFRAME);
$ch->moveTo(100,100);
$ch->setName("circle");
$m->setDimension(320,240);
$m->nextFrame();


header('Content-type: application/x-shockwave-flash');
$m->output();

?>
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