[TYPO3-RTE] Width of the RTE-editing-window in not-fullsreen-mode

[Christopher]

Hi guys,

I know that with the following code I can adjust the width of the editing 
window in fullscreen-mode:
TCEFORM.tt_content.bodytext.RTEfullScreenWidth = 574px

But is there also a way to set something like this in normal, 
not-fullscreen-mode?

Kind regards

Christopher