One more idea, no redirects involved: Just write a generic article about the Yahoo toolbar (put it on an article directory, minisite or a hubpage) talking up the toolbar, and incidently state it could help you make money online. Put two links at the end, one for the CJ link, and another for a free (1-2 page) ebook of you slapped together about "How to make money with Yahoo." The latter link actually goes to a TrialPay page you've set up (the direct processing page, your article serves as the landing page). The user gets the ebook once they complete a free offer.
And what's in that ebook? An explanation of an incentive offer where if they click on the other (CJ) link and download the toolbar, you'll paypal them 50 cents or so---thus fulfilling your promise to show them 'how to make money with Yahoo.' The referrer looks to CJ as being a totally legit hubpage or article site, and they're unlikely to complete the Trialpay offer to find your incentive offer in the ebook. You make money on either article link that's clicked where the action is completed, and maybe they'll both get clicked!