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Earthlink has a new service to block pop up (or under) ads. That's cool, but you can already do this with mozilla (on any platform, through any ISP.)
In mozilla open preferences (in the 'edit' menu except on OS X where it's in the mozilla menu) and click on 'scripts & windows' under the 'advanced' category. Then uncheck 'open unrequested windows'. While you're at it, you probably want to uncheck 'open a link in a new window', 'move or resize windows', 'raise or lower windows', and 'change status bar text'.
Done and done.