Extend Network Using Wireless Link Between Two Belkin G / MIMO ADSL Router?

I've recently upgraded my internet provider to BT and received a BT Home Hub 3 as the new wireless router.Previous to this I was using a wireless Belkin G + MIMO ADSL router (model number F5D9630-4).There are places in the house where the wireless signal is very poor. Connecting to the internet using either of these routers is difficult in these spots. However, since the Belkin is now spare, I've been thinking about trying to use it as a low cost repeater (i.e. free) to extend the wireless range in the house.There are several good articles that I've found on this site which address the connection of two routers together (e.g. John Will's article on connecting two SOHO routers is a good example), but they rely on an ethernet connection between the two routers. Any way to establish a wireless link between the two routers to extend the range of the current wireless network.