You can only donate once per day, but I understand that if you use a dial-in connection to the internet, you hace a dynamic IP address, and may re-click once you've logged off and then back on. Unless they use cookies to determine who's been there today, that should work.
--Baloo
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I once lost my corkscrew and had to live on food and water for several days
-W.C. Fields
http://members.tripod.com/~Bob_Baloo/index.htm