help me with sharing internet connection

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http://forums.opensuse.org – Hi I'm new new to linux . I need your help !! I read many howto-s and other links but I couldn't setup a proper connection . my computer connects to the Internet directly through the device named eth0 ( DSL PPPoE ) I'm using Kinternet to connect and disconnect my Internet connection . My sister has Windows Vista, and I want to setup a wireless connection ( in vista and 7 I could easily setup an ad-hoc connection ) so I can share the Internet with her computer . I'm using openSUSE 11.2 . I'm not sure but I think the driver for wlan card is properly installed . The card is a D-Link DWA-520 and madwifi drivers were installed with openSUSE (Distributions)