Using full code instead of shortcode

You can embed the JW Player anywhere by just using the html embed code:

<script type="text/javascript" src="https://wordpress.stackexchange.com/path/to/jwplayer.js"></script>

<div id='mediaspace'>This text will be replaced</div>

<script type="text/javascript">
  jwplayer('mediaspace').setup({
    'flashplayer': 'player.swf',
    'file': 'http://content.longtailvideo.com/videos/flvplayer.flv',
    'controlbar': 'bottom',
    'width': '470',
    'height': '320'
  });
</script>

If you have options that you want to change, you can always use the JW Wizard.