How to add javascript to plugin?

Hi,

Now I created a vSphere Web Client plugin, and I wanna my plugin communicate with JavaScript.

So now I do not know where should I put it. I checked my plugin html source code as following:

----------------

.....

   <link type="image/x-icon" href="assets/application.ico" rel="shortcut icon" />

   <script type="text/javascript" src="history/history.js"></script>

   <script type="text/javascript" src="assets/swfobject.js"></script>

   <script type="text/javascript" src="assets/jquery.min.js"></script>

   <script type="text/javascript" src="assets/jquery.scrollbars.js"></script>

   <script type="text/javascript">

  //<![CDATA[

  swfobject.embedSWF(
  'UI.swf',
  'flashContent',
  '100%',
  '100%',
  '11.1.0',
  'playerProductInstall.swf',
  false, {
  quality: 'high',
  bgcolor: '#ffffff',
  allowscriptaccess: 'sameDomain',
  allowfullscreen: 'true',
  menu: false,
  flashvars: 'locale=en_US&localeChain=en_US&resourceModuleURLs=locales/UI-en_US.swf',
  scale: 'noscale',
  wmode: 'opaque'
  }, {
  id: 'container_app',
  name: 'container_app',
  align: 'middle'
  });
  swfobject.createCSS('#flashContent', 'display: block; text-align: left;');
  $.scrollbars({
  swfId: '#container_app'
  });
  //]]>
   </script>

...

//other code

-----------------------------

Here I wanna to add my javascript  such as app.js after    <script type="text/javascript" src="assets/jquery.scrollbars.js"></script>

.Just like

--------

   <link type="image/x-icon" href="assets/application.ico" rel="shortcut icon" />

   <script type="text/javascript" src="history/history.js"></script>

   <script type="text/javascript" src="assets/swfobject.js"></script>

   <script type="text/javascript" src="assets/jquery.min.js"></script>

   <script type="text/javascript" src="assets/jquery.scrollbars.js"></script>

<script type="text/javascript" src="assets/app.js"></script>

-------

Could anyone reply me ?

I will be appreciated that.