Stuck behind the bookshelf.

[markiu200]

Hello there.
I have managed to get behing the bookshelf in one room, and I can't get out of there now .

It's in the room where you find the string that can be attached to empty jar.
Mentioned bookeshelf is to the right of the table (on which the string can be found).
Place looks like this:

WWWWWW
W-X-B-BB--
W--B-------
W---------
WT-------------E
WT-------------E
W---------

Where:
W is a wall;; B is a bookshelf;; T is a table;; E is entrance;; X is where im stuck. "-" is an empty space.

Any advise how could I get out of there would be appreciated. Thanks in advance.