code: function ()
  	{
  		for ( var i=0, iLen=this.s.dt.oInstance.length ; i<iLen ; i++ )
  		{
  			if ( this.s.dt.oInstance[i] == this.s.dt.nTable )
  			{
  				return i;
  			}
  		}
  		return 0;
  	}
docs: Get the position in the DataTables instance array of the table for this
  instance of ColVis
  @method  _fnDataTablesApiIndex
  @returns {int} Index
  @private