Depth values for movie clips can range from -16384 to 1048575. If you create or attach a new movie clip on a depth that already has a movie clip, the new or attached clip overwrites the existing content. To avoid this problem, use the MovieClip.getNextHighestDepth() method; however, do not use this method with components that use a different depth-management system. Instead, use DepthManager class with component instances. For more information, see ActionScript 2.0 Components Language Reference.