Help with simple AS3 rollover plays flv

hi Folks
I am brand new to AS but am committed to learning it.  This is my very first simple project....
I would like an flv on the stage to play back when you roll over an invisible button next to it.  I have three layers in the Timeline: a button, a video and an actions layer
I have imported the flv to the stage ("clouds"), and made the button.  The code I have so far on the actions layer on frame one is:
clouds_btn.addEventListener(MouseEvent.ROLL_OVER, playClouds);
function playClouds(event:MouseEvent):void {
play("clouds");
playClouds();
As I understand this: On the first line we define the button instance (clouds_btn); add an event listener to it; describe in the parentheses the parameters: a rollover mouse event triggering the function I have named "playClouds"
Then I write the function: naming, identifying it as a mouse event.  The actual function between the curly braces has me stumped and that is as close as I could come by myself.  I can't find a list of "actions" anywhere- (play, gotoandPlay, etc) and i am very unclear on the syntax
Then on the last line I call the function, which i *think* is necessary here.
Questions:
Do I need a stop(); anywhere in this code.  Why?
Do I need 2 functions (rollOn, rollOff) to make this work?
I am sure the code and my understanding of it needs some real help...
Any hard info, pointers to documentation, online resources, etc. would be great.  Its a pretty hard thing to learn on your own......
Thanks!

If you have planted the video along the timeline, then your code should be...
stop();  // to stop the timeline in the first frame
clouds_btn.addEventListener(MouseEvent.ROLL_OVER, playClouds);
function playClouds(event:MouseEvent):void {
     play(); // to play the timeline

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