code: function _fnStringToCss( s )
  	{
  		if ( s === null ) {
  			return '0px';
  		}
  	
  		if ( typeof s == 'number' ) {
  			return s < 0 ?
  				'0px' :
  				s+'px';
  		}
  	
  		// Check it has a unit character already
  		return s.match(/\d$/) ?
  			s+'px' :
  			s;
  	}
docs: Append a CSS unit (only if required) to a string
  @param {string} value to css-ify
  @returns {string} value with css unit
  @memberof DataTable#oApi