nostring accepts only on

multicheckbox without extra string input

Prevent undefined error by checking on slen

Fixed undefined errors

Undefined offset, initialize as null

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* Fixed identified issue with button spans by replacing missing closing span tag as identified by selfthinker, removed in ae61441.

Fixed several undefined errors.

* Changed the flow of the navigation button HTML so the navigation buttons actually flow to the right.

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rtl styles for media manager. Requires also rtl depended change in javascript..

handle 'e' set a resize handle at east side, 'w' at west side.

little cleanup media.js

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