Spare router to use as an Access Point

Hi All,
I have a spare router that I want to set up as an access point. Since I have not tackled this type of problem before I am hoping to receive some help and suggestions to achieve the end result.

Basically, what I want to do is set up a wireless access point(B) which will be located some distance from and at the other side of the building to a broadband wireless router position(A).

So I need some advice on what settings I will need to enter into the router and access point so that I can hardwire a PC into the access point and be able to connect wirelessly to the broadband router and then access the rest of my network and also connect to the internet.

I realise that this might not be feaseable or even possible! but I would welcome any comments, good or bad.

Thanks to all in anticipation.

ticker