Awesome man! To Reeseo: I changed the units to em, and that made it way worse. Now, I absolutely have no clue about programming..but i just deleted 990px and put in "auto" (without quotes) and it removes the scroll bar and fits my screen perfectly. Don't know if what I did was dumb or noobish, but hey, it worked for me. Thanks again.
FYI: (1) By using "em" units rather than "px" units for the div[id=msgs] element, I could let the width of the message box vary automatically according to the current font size, conserving "about 80 column" convention. In other words, regardless of the zooming by Ctrl-+ and Ctrl-- feature of Firefox, my Gmail always displays about 80 alphanumeric characters per one line.
(2) Also by using "em" units for the div[id=fic] element, I could fine-tune the horizontal distance between the message box and special menus, conserving almost same (minimal) distance regardless of the zooming. :)
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