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Recently we have migrated from using the old ga.js to the new asynchronous code while also installing the Ecommerce tracking. It was a difficult task until I found this: [code.google.com...]
BTW be aware that at the moment I migrate my tracking code all my 3 years of data collection were deleted. Luckily I had excel backups files. So if you want to change your tracking code please be aware of this.