MovieClip Depth issue?

Normally in as 2.0 we cant access movieclips at depths? like if a movieclip is inside another movieclip?

In as 3.0 i could access it by

var mc:MovieClip=objs.getChildAt(0) as MovieClip;

and then play the movieclip.(animation)

having difficulties accessing it in as 2.0, i tried

this.swapDepths(this._parent.getNextHighestDepth());

but no success… can anyone of u flash guru’s help me out :cry3: