/etc/config/wireless:

config wifi-device  wifi0
	option type     atheros
	option channel  3

	# REMOVE THIS LINE TO ENABLE WIFI:
#	option disabled 1

config wifi-iface
	option device	wifi0
	option network	wifi
	option mode	sta
	option ssid	SSIDofMyWLAN
	option encryption none


/etc/config/network:

config interface loopback
	option ifname	lo
	option proto	static
	option ipaddr	127.0.0.1
	option netmask	255.0.0.0

config interface lan
	option ifname	eth0
	option type 	bridge
	option proto	static
	option ipaddr	192.168.1.1
	option netmask	255.255.255.0

config interface wifi
	option ifname	wifi0
	option proto	static
	option ipaddr	10.0.1.3
	option netmask	255.255.255.0