public function or_on($c1, $op, $c2)
	{
		$this->_last_join->or_on($c1, $op, $c2);

		return $this;
	}
public function or_on($c1, $op, $c2)
	{
		$this->_last_join->or_on($c1, $op, $c2);

		return $this;
	}
public function or_on ( $ c1 , $ op , $ c2 ) { $ this -> _last_join -> or_on ( $ c1 , $ op , $ c2 ) ; return $ this ; }
Adds "OR ON ..." conditions for the last created JOIN statement.

@param   mixed   $c1  column name or array($column, $alias) or object
@param   string  $op  logic operator
@param   mixed   $c2  column name or array($column, $alias) or object

@return  $this
Adds OR ON ... conditions for the last created JOIN statement .