thumbs1 ebaystatic.com phishing? in Opera

I recently move to Opera for internet use. This problem doesn't seem to occur to my knowledge with IE.

Problem... just this afternoon, a few minutes ago I received an email from a printing service. I use yahoo classic mail. I've received several emails today and responded to a couple with no issues. This latest one I opened it and downloaded the xcell spread sheet attached. Looked at it and then tried to respond to the sender. Instead an ebay web page opened in a new tab and the yahoo email tab lower left display "thumbs1.ebaystatic.com" transfering blah... :cry

This is in Opera and not IE. I can't use IE (theres another thread to cover the poor startup performance issue)

Help!

Dana