$(document).ready(
	function() 
	{
		$.tablesorter.addParser({ 
			id: 'formattednumbers', 
			is: function(s) { return false; }, 
			format: function(s) {	        	
				return s.replace(/[^\d]/g,''); 
			},  
			type: 'numeric' 
	   });
		
		$("table#keywordsTable").tablesorter(
		{
			cancelSelection: 'true',
			widgets: ['zebra'], 
			headers: { 
				2: { sorter: 'formattednumbers' },
				3: { sorter: 'formattednumbers' },
				4: { sorter: 'formattednumbers' },
				6: { sorter: 'formattednumbers' }
			}
		});
	}
);