oldpopsie

I am using Eudora version 5.0
My browser is Opera version 7.11
Lately, whenever I click on a url in one of my emails, it opens a blank page
in Opera, as well as the requested page. Apparently I have somehow changed a
setting, but I have no idea what or how.
This isn't super critical, but it is annoying and uses up unnnecessary space
in the browser. I'd like to stop it.
Does anyone have any suggestions?