following are codes to show how one can run flv and mp4 videos in
their websites using jwplayer - http://www.longtailvideo.com/players/

first download the player from the above address and add all files in your
website root.

in head section of the page -

<script src="/Scripts/jquery-1.7.1.js" type="text/javascript"></script>
<script type="text/javascript" src="/jwplayer.js"></script>

<script type="text/javascript">

$(document).ready(function () {

$('#button_click').click(function () {
jwplayer("container_click").setup({
flashplayer: "player.swf",
file: "SC_Video_950px.mp4",
height: 370,
width: 680,autostart: true,
});
});

});

</script>

in body of the page -

Call the player on button click -
<div id="button_click" style="font-weight:bold; color:Blue;">
Click me to run video</div><br />
<div id="container_click">player shown here..</div>

I hope it helped you very much.don't forget to give a +1 for
that page in google search.