You are better off getting a USB wireless adapter, which are lot cheaper and can also be used on your desktop incase you retire your old laptop.
USB wireless adapters are in the price range of $9.00 - $20.00
Here is the one which is on sale for $9.00
TRENDnet’s TEW-424UB 54Mbps 802.11g Wireless USB 2.0 Adapter
http://www.ecost.com/ecost/shop/detail.asp?dpno=498649