Script in AS3 for testing in AIR

The essence of the technical task is very simple.
According to the attached template, it is necessary to write a script, an engine that, according to the specified on the first page of the time scene: alternation of frames and the time of the lesson session, begins in a single stroke with a given interval, but randomly output frames from the clips vclip, nclip and nccin.
Ghelp and gindex buttons go to and from instructions located on the 4th frame of the main scene
At the end of the session, proposes to return to the session or withdraw
The specified time of alternation of frames (stroke) in the range 0.2 to 3
Second, in 0.4 increments
Session time from 5 to 45, the choice multiplicity 5 minutes
At the time of the session, the sp slider indicates a value in the range of 0.3 to 2 seconds, the buttons bt_Up and bt_Dn can change the value of the variable interval.
The number of frames in the clips will change in the future, i.e.
The description of the variable array should be clear.