Adding Video(.M4V) and calling it using buttons

I created the stuff and it works perfectly fine from a Flash Player. However, the videos don't load, if I open it in IE or the Chrome Browser.

Code:

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import flash.events.MouseEvent;

import fl.controls.Button;

stop();

txtTitle.text = "";

btnPres1.addEventListener(MouseEvent.CLICK, buttonClick);

btnPres2.addEventListener(MouseEvent.CLICK, buttonClick);

btnPres3.addEventListener(MouseEvent.CLICK, buttonClick);

function buttonClick(e:MouseEvent)

{

  var buttonIndex = e.target.name.substr(7);

  movieHolder.source = "Presentation1_part" + buttonIndex + ".mp4";

  switch (buttonIndex)

  {

  case "1": txtTitle.text = "XYZ1";

  break;

  case "2": txtTitle.text = "XYZ2";

  break;

  case "3": txtTitle.text = "XYZ3";

  break;

  }

}

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