Determining the depth of an instance

To determine the depth of a movie clip instance, use MovieClip.getDepth().

The following code iterates over all the movie clips on a SWF file's main timeline and shows each clip's instance name and depth value in the Output panel:

for (var item:String in _root) {
    var obj:Object = _root[item];
    if (obj instanceof MovieClip) {
        var objDepth:Number = obj.getDepth();
        trace(obj._name + ":" + objDepth)
    }
}

For more information, see getDepth (MovieClip.getDepth method) in the ActionScript 2.0 Language Reference.