Dynaic movie clip removal

How do I remove a dynamic movie clip or check if it exists and then delete it?? Urgent help on this please.’

I have a registration module done in flash where i create a movie clip like this:
var container:MovieClip = _level0.printCardpls.createEmptyMovieClip(“container”, this.getNextHighestDepth());

and on completion i go to frame one. Where I would like to check to see if it exists and then delete it if it sill does. Then when the user hits frame 15 for example where it gets created again, its fine.