Google DD-WRT. If your Asus has this custom firmware available then you can set it up as a wireless bridge.
http://bit.ly/1dPms6v (The site is down at the moment).
I have a Linksys E1200 (Cisco) running DD-WRT that bridges wirelessly to a Netgear DGND3700.
<Edit>
Don't think DD-WRT is supported but Padawan firmware is apparently capable of this
http://bit.ly/KAx2mv
http://bit.ly/1dPrU9m