mask efects

the mask effect is some thing covering an object  and object such as a figure that is put in front of the text. then u create it in to a symbol (graphic) to add a motion tween. and slide the motion tween across the stage and in front of the written text. then you go to modify and layer properties. there you can mask it. mask the object and then play the movie, nothing happens....

then select the text layer and go to modify and layer properties again, select MASKED..noticed ED.. and then play movie.