Binding 2 mouse buttons to same action (mx518)

[Makyla]

i just got a logitech mx518, it has 2 mouse buttons near thumb (mouse4 and mouse5). i would like them both to perform the same action in hl2/css - +forward. the game gui only lets you choose 1 key/button for each action. so i tried editing config.cfg, i tried

bind "MOUSE4" "+forward"
bind "MOUSE5" "+forward"

and it ends up deleting one of these lines (the one thats not in the gui) and makes it so one of the buttons doesnt do anything. the reason i want this is cause i have big (huge! ) hands and i sometimes hit both buttons.
i tried editing mouse software to make the buttons unassigned but it doesnt help.
anyone know how to make it so either of the two buttons will do the same thing?? thanks

 

[Makyla]

nevermind i figured it out, have to add both binds to the autoexec..

 

[westie]

You mind telling us how to do it?

 

[Bobcat]

bind mouse4 "+forward"
bind mouse5 "+forward"