Update video source when clicking on a link below the video frame

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Question description

I am trying to have a page with embedded video that dynamically will change the source when a link below the video frame is clicked. The source videos are on my host server.
i.e. this pic illustrates it:

I came across [this page], which seems to have the answer, but I tried it and it didn't work.  Following the example, I pasted the css & javascript in the <head> and the necessary html in the body.  I updated all the references to my urls and tried to keep file names the same as the example for testing.
Below is what I tried.  

Can someone point out my errors, or provide a more elegant way of doing this?  Basically dynamically change embedded video when link is clicked and the video work in all the typical browsers, and most devices.
This is for a wordpress site, using JW Player for wordpress

It loads the pre image but doesn't play.

As a test I tried this and it does play single video properly:
  <video id="testvideo" class="video-js vjs-default-skin" width="440" height="300"  controls="controls">
  <source src="http://www.mywebsite.net/videos/testvid_01.mp4" type="video/mp4"/>
  <source src="http://www.mywebsite.net/videos/testvid_01.webm" type="video/webm"/>
  <source src="http://www.mywebsite.net/videos/testvid_01.ogv" type="video/ogg"/>

The javascript version for multiple source links

<!DOCTYPE html>

       <style media="screen" type="text/css">
  .wrap  { margin:30px auto 10px; text-align:center }
  .container  { width:440px; height:300px; border:5px solid #ccc }
  p  { font: 10px/1.0em 'Helvetica',sans-serif; margin:20px }
  $("input[type=button]").click(function() {
  var $target  = "testvid_"+$(this).attr("rel");
  var $content_path  = "http://www.mywebsite.net/videos/";  
  var $vid_obj  = _V_("div_video");
  // hide the current loaded poster
  $vid_obj.ready(function() {
  // hide the video UI
  // and stop it from playing
  // assign the targeted videos to the source nodes
  // replace the poster source
  // reset the UI states
  // load the new sources
  </script>   </head>
       <section class="container wrap">
  <video id="div_video" class="video-js vjs-default-skin" controls preload="auto" width="440" height="300" poster="http://www.mywebsite.net/videos/testvid_01.png" data-
  <source src=""  type="video/mp4">
  <source src=""  type="video/ogg">
  <source src=""  type="video/webm">
  <div class="wrap">
  <input rel="01" type="button" value="load video 1">
  <input rel="02" type="button" value="load video 2">
  <input rel="03" type="button" value="load video 3">

The preload image for the 1st video loads but no video, error is
"No video with supported format and MIME type found"

So I added the source for the first video in this section

  <source src="http://www.mywebsite.net/videos/videos/testvid_01.mp4"  type="video/mp4">
  <source src="http://www.mywebsite.net/videos/videos/testvid_01.ogv"  type="video/ogg">
  <source src="http://www.mywebsite.net/videos/videos/testvid_01.webm  type="video/webm">

Result the 1st video loads but not the other linked videos.

names of the videos/png:
testvid_01.mp4, testvid_01.ogv, testvid_01.webm, testvid_01.png
testvid_02.mp4, testvid_02.ogv, testvid_02.webm, testvid_02.png
testvid_03.mp4, testvid_03.ogv, testvid_03.webm, testvid_03.png

I have tried this both in wordpress page and html page the results are the same.

I'm not sure even if this script will do what I want?

To get paid for the solution:  requires a working example, not just code suggested changes.

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