Why I don't see any icons for printing, saving and exporting the table?

Denonth

Hi ,
I want to see the buttons on my table so I can be able to copy, save, and export data from the table.
this is the code that I have been using. But I don't see any button and everything seems to be ok:

[code]
$('#jphit').dataTable( {
"bProcessing": true,
"bServerSide": true,
"sScrollY": "350px",
"bDeferRender": true,
"sDom": 'T<"clear">lfrtip',
"oTableTools": {
"aButtons": [
"copy",
"print",
{
"sExtends": "collection",
"sButtonText": "Save",
"aButtons": [ "csv", "xls", "pdf" ]
}
]
},
"sAjaxSource": "increment_table.php"
} );
[/code]