Calling functions of a loaded swf?

I have placed a movie clip on the stage, with the variable name mcThumbnail. The following code in entered in the first frame (the only frame of the timeline…).


mcThumbnail.loadMovie("ad_scrolling.swf");
mcThumbnail.currPageType = "MAIN";
mcThumbnail.initAd();

However it does not invoke the function of the abovestated .swf. And it does not change the value of the above property either.

What have i done wrong here? One question i have is, what is the difference between loading the using a ‘movieclip’ and loading using a ‘loader’.