Sky router - possible to fix IP addresses?

I am thinking of moving to Sky from O2. I have two WiFi connected devices that don't like their IP addresses (granted by DHCP from the router) being changed. In the O2 router it is possible to change a device entry so that its DHCP lease never expires, so that the IP address is essentially static. Is it possible to do something similar on the router supplied by Sky?
TIA

Yes, the sky router allows address reservation. It's done by associating the devices MAC address with the desired IP address.

As per what Chris said, this is what it looks like on the router interface:

http://i50.tinypic.com/206lnp1.jpg

Thanks to you both for the info.