Press keyboard-key, then play randomly 1 of 7 videos

I want a simply function where I press the Enter-Key and then randomly 1 out of 7 imported videos starts playing.

Every video should be invisible first and should go invisible again after playing.

I tried to create it based on information I found, but I have the feeling it is very wrong and there are even simpler ways to create it

What is the best and simpliest Actionscript code to get this effect?

The name of the videos are video1, video2, video3, video4, video5, video6, video7.

Here is just for reference my code (but I guess there is not that much to take out of it):

video1.visible = false;

video2.visible = false;

video3.visible = false;

video4.visible = false;

var SelectMC:Number = 0;

addEventListener(KeyboardEvent.ENTER);

function fl_ClickToHide(event:KeyboardEvent):void

{

    function getMC() :void

    {

        var SelRam:Number = Math.random ();

        SelectMC = Math.round (SelRam*4+1);

        trace(SelectMC);

    }

    getMC();   

}

stage.addEventListener (Event.ENTER_FRAME,EntFrame);

function EntFrame(e:Event):void

{

    }

    if (SelectMC == 1)

    {

    video2.visible = false;

    video3.visible = false;

    video4.visible = false;

    video1.visible = true;

    }

    if (SelectMC == 2)

    {

    video1.visible = false;

    video3.visible = false;

    video4.visible = false;

    video2.visible = true;

    }

    if (SelectMC == 3)

    {

    video1.visible = false;

    video2.visible = false;

    video4.visible = false;

    video3.visible = true;

    }

    if (SelectMC == 4)

    {

    video1.visible = false;

    video2.visible = false;

    video3.visible = false;

    video4.visible = true;

    }

}