changing width of attachments if too big

[squishi]

I don't want to rebuild the attachments, because I only want to change their size in one style. The other style is okay.

Ideally I would change both the img and attachment code and insert a width tag, if the width of the image is too big. If not, then I don't want to scale it.
Could this be done without editing the vb source code?

--------------- Added [DATE]1216498442[/DATE] at [TIME]1216498442[/TIME] ---------------

I saw that there is a mod for this:
https://vborg.vbsupport.ru/showthread.php?t=176531

Don't know if this is only for IMG tags or also the attachments.
I guess I will try to modify that addon so that it only runs when the user is using that special style.