public function addTable( $table, $prefix = NULL )
	{
		$prefix	= $prefix === NULL ? $this->prefix : $prefix;
		if( is_array( $table ) )
			return $this->addTables( $table, $prefix );
		if( in_array( $prefix.$table, $this->tables ) )
			return FALSE;
		$this->tables[] = $prefix.$table;
		return TRUE;
	}