We use a number of different ad platforms. For example, AdWords and AdRoll, and they each have their own conversion pixles. I'd like to be able to come up with an easy way to selectivly put conversion pixles on the relevent pages when desigining new landing pages for ads. Is there a best practice to do this easily? Right now I have to create a new template for each page and put the pixle in the specific page. I'd rather not have to create new templates every time I want to put a new conversion pixle or new tracking code.