The Breast Cancer Site uses sponsorship to pay for mammograms, and each click to a specific page on their site pays a little of the bill.

It is no scam and is a legitimate charitable service, see the following links to verify:
http://www.snopes.com/inboxer/charity/mammogram.asp
http://www.breakthechain.org/exclusives/cancersite.html

Click here to open the site, then click the pink button that says "FUND FREE MAMMOGRAMS"....

Painless. You can do it.