Javascript|Jquery : Script not loading -

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got weird problem cant fix : i've html page javascript have code aint working, tried simple alert got same problem : code between tags doesnt appear when @ source code in browser , cant see when in browser debugger... 

 <script type="text/javascript">       $(document).ready(function(){         alert('hzhz') ;       });  </script>

when page source, can see : 

<script type="text/javascript"></script>

if has idea or can tell me should for, great !

thx !


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