Laptop and wireless internet conncetion

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My laptop is an Acer aspire  1353LM (with Windows XP). I bought it in
february  2004.
I am going to move in to a place where there is  wireless Internet
My laptop is not compatible with this kind of conncetion.
Do you how it is possible to make it compatible? inserting a card?
How much expensive could be?

Is the  wireless Internet connection slower than the normal one?
Can you use skype with that?

Thank you for your answers.

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