Do Not Set the with of the column in the dataTable

Hi, I am not able to set the width of my data Table and for setting my data Table width i am using this code .

"bProcessing": true,
		"aoColumns": [
		{ "sWidth": "12%"},
		{ "sWidth": "10%" },
		{ "sWidth": "10%" },
		{ "sWidth": "8%" },
		{ "sWidth": "5%" },
		{ "sWidth": "8%" },
		{ "sWidth": "15%"},
		{ "sWidth": "7%" },
		{ "sWidth": "7%" },
		{ "sWidth": "10%"},
		{ "sWidth": "10%"}
		],
		"sScrollY": tableheight,
		"bJQueryUI": true,
		"bAutoWidth": false,
		"iDisplayLength": <?php echo PAGESIZE ?>,
		"bSort": true,
		"sPaginationType":"full_numbers",

But the above code is not working properly .Please anybody suggest me if there is any problem in my code or solve my problem by using any other code