External swf and tween

i have an external swf which i import into my main swf using the loadMovie command. my external swf has some tween class animations in it. if i run the main movie, the external swf movie runs fine of course…but the tween classes are not loaded. am i missing somthing?

here is the code from the external swf file which is applied to a clickable movie clip of course.

**this.onRollOver = function() {
rewind = false;
play();
var squaretween = new mx.transitions.Tween(previewthumb, “_xscale”, mx.transitions.easing.Elastic.easeOut, 0, 1200, .5, true);
var squaretween = new mx.transitions.Tween(previewthumb, “_yscale”, mx.transitions.easing.Elastic.easeOut, 0, 1200, .5, true);
squaretween.onMotionFinished = function() {
loadMovie(“hotairlarge.swf”, “_root.homecontainer.printworkcontainer”);
}
};

**any help would be great!