Put next code to your .emacs file.
(global-set-key '(button4) 'scroll-down-command)
(global-set-key '(button5) 'scroll-up-command)
Put next code to your .emacs file.
(global-set-key [mouse-4] 'scroll-down)
(global-set-key [mouse-5] 'scroll-up)
Put next code to your .Xdefaults file,
xrdb .Xdefaults, restart your netscape.
Netscape*globalNonTextTranslations: #override\n\
Shift<Btn4Down>: LineUp()\n\
Shift<Btn5Down>: LineDown()\n\
None<Btn4Down>:LineUp()LineUp()LineUp()LineUp()LineUp()LineUp()\n\
None<Btn5Down>:LineDown()LineDown()LineDown()LineDown()LineDown()LineDown()\n\
Alt<Btn4Down>: xfeDoCommand(forward)\n\
Alt<Btn5Down>: xfeDoCommand(back)\
Alt<Btn4Down> means wheel up with Alt
key. LineUp() function move one line up. Then,
None<Btn4Down> line means if you round one step
wheel, up 6 lines.