text: 
  $.extend( DataTable.ext.oSort, {
  	/*
  	 * text sorting
  	 */
  	"string-pre": function ( a )
  	{
  		if ( typeof a != 'string' ) {
  			a = (a !== null && a.toString) ? a.toString() : '';
  		}
  		return a.toLowerCase();
  	},
  
  	"string-asc": function ( x, y )
  	{
  		return ((x < y) ? -1 : ((x > y) ? 1 : 0));
  	},
  	
  	"string-desc": function ( x, y )
  	{
  		return ((x < y) ? 1 : ((x > y) ? -1 : 0));
  	},
  	
  	
  	/*
  	 * html sorting (ignore html tags)
  	 */
  	"html-pre": function ( a )
  	{
  		return a.replace( /<.*?>/g, "" ).toLowerCase();
  	},
  	
  	"html-asc": function ( x, y )
  	{
  		return ((x < y) ? -1 : ((x > y) ? 1 : 0));
  	},
  	
  	"html-desc": function ( x, y )
  	{
  		return ((x < y) ? 1 : ((x > y) ? -1 : 0));
  	},
  	
  	
  	/*
  	 * date sorting
  	 */
  	"date-pre": function ( a )
  	{
  		var x = Date.parse( a );
  		
  		if ( isNaN(x) || x==="" )
  		{
  			x = Date.parse( "01/01/1970 00:00:00" );
  		}
  		return x;
  	},
  
  	"date-asc": function ( x, y )
  	{
  		return x - y;
  	},
  	
  	"date-desc": function ( x, y )
  	{
  		return y - x;
  	},
  	
  	
  	/*
  	 * numerical sorting
  	 */
  	"numeric-pre": function ( a )
  	{
  		return (a=="-" || a==="") ? 0 : a*1;
  	},
  
  	"numeric-asc": function ( x, y )
  	{
  		return x - y;
  	},
  	
  	"numeric-desc": function ( x, y )
  	{
  		return y - x;
  	}
  } );
  