thanks tiger.. you rock

i am really dumb not to check out the help files before

thanks tiger ! actually its an intro for a full screen presentation and my stage is 1152 x 480 pixels. i want to display content within this area. i want to mask in AS not in flash it works well in flash .. i export swf from AS to flash. in flash i create a mask.. but how to mask the stage in AS any...

i am a completely new to AS, so dont mind if it sounds silly :) i have set the stage dimensions, and, objects come across the stage from bottom and move out from the top. but when i render SWF, i can still see the objects off stage. how do i show only objects on the stage in my final output.. please...