You need (like the last poster says) an adsl modem router,as your pc will need a network (lan) connection,as like the PAP2 will. There are no adsl modems as far as I'm aware with just 2 lan sockets on for what you need,3 maybe,but not 2.
Look at some of the bargains staples or pc world are offering as old stock.
A complete setup can cost just £49 for wireless with a card and router in one box,if you want to go down that road.
You cannot have a 'passthrough' lan connection if thats what you were looking for,it just doesn't exist!
Maybe you would of been better off getting a usb ata if your pc is online all the time.
The most common sold items are usually cheaper thru demand,so you might have to diverse and buy a box with extra unwanted functions for less money than a box that does exactly what you want it to.
I needed just an access point last year,it was £30 dearer at the time than a modem,firewall,router,4port switch than just the access point made by the same people!!