Check for movie clips with AS?

Ehhm. you need to place this code in the first frame of your movie - just to be sure

So basically you want to create a function that is called each time any movieclip appears anywhere in the FlashMovie ?

That could be easy done with prototypes. I have not tested it but i am pretty sure that will work:

MovieClip.prototype.init = function() {

trace("Yo ! i am your new movieclip. My instance name is "+_name);
// do whatever you want to do within that movieclip here. Remember that you are already INSIDE of the movieclip

};
MovieClip.prototype.onLoad = function() {

init();

};

if you're not fading every movieclip instantiated on a particular frame how will you decide which movieclips need to be faded?

will it fade every movieclip found?

yes, though i'm not sure what you need to do. but i'm fairly certain it can be done.

do you want to define a function that returns all the movieclips instantiated on a particular keyframe?