datatable and json

hi,
I'm a noob in javascript and php.

I'm trying to use datatable with ajax.But it's not working.

Here is my code:

 <script>
			$(document).ready(function() {
				var oTable = $('#example').dataTable( {
					"bProcessing": true,
					"bServerSide": true,					
					"sAjaxSource": "get_data.php"
				} );					
			} );
		</script>
 

Here is my return of json in get_data.php:

{"sEcho":0,"iTotalRecords":"37","iTotalDisplayRecords":"37","aaData":[[" TREXOTIQUE","488480070","mr name","","BOX 20 Kva",null,"60 MOIS","FRED","","","RETRACTE",""],["WYYWICH","789352598","mr name","","BOX 10KVA",null,"60 MOIS","FRED","","","gh",""],["CAPUCINNO GOUR","507606333","mr name","","BOX 10KVA",null,"60 MOIS","FRED","2125,53","06\/02\/2013","",""],["LEEDIVE","514718675","M mr name","","BOX 20 Kva",null,"60 MOIS","FRED","2125,53","06\/02\/2013","",""],["TARIA OLES","535231583","mr name","","BOX 10KVA",null,"60 MOIS","FRED","","","",""]]}

and my html table:

 <table class="datatable" id="example">
              <thead></thead>
              <tbody></tbody>
	 </table>

my page is blank there is nothing