cstrike

This script allows you to cycle through your weapons with the mousewheel when on, and will rebind your MWHEELUP to +attack2 and MWHEELDOWN to +reload when off. MOUSE3 is used in this example to toggle it on and off.

Spoiler:

alias "wpn1" "invprev; +attack; wait; -attack"
alias "wpn2" "invnext; +attack; wait; -attack"
alias "toggle1" "bind MWHEELUP +attack2; bind MWHEELDOWN +reload; bind MOUSE3 toggle2"
alias "toggle2" "bind MWHEELUP wpn1; bind MWHEELDOWN wpn2; bind MOUSE3 toggle1"

bind "MOUSE3" "toggle1"
bind "MWHEELUP" "wpn1"
bind "MWHEELDOWN" "wpn2"