Set Size and Frame Rate
Flash CS3 Tutorial
How to Set Stage Size and Frame Rate in Flash
A project's frame rate and stage size are set when you start a project. This is also a good time to set the Flash Player version.
Choose Modify > Document (Cmd/j (PC-Ctrl/j)) to open the Document Properties.
Dimensions (Height and Width) sets the stage size. For web projects, set Ruler units to pixels.
Enter a value for the frame rate.