query string for the directory

hello everyone,,
i dont know where to post this question the fourm but i hope this is the right place.
 
i have this

http://localhost/items/item/getitem.aspx?id=100
 and i want to be like this

http://localhost/items/item/?id=100


the question explain it self.
(using asp.net 2.0 with C# .. IIS 5.1 or 6.0)
thanks in advance

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