We are an online media agency. We buy media for many advertisers from a variety of online networks (e.g. Google, Yahoo, etc). We need a tracking pixel script/admin tool that will enable us to create tracking pixels for each of our advertisers to track a sale/lead. In addition we need the ability to bind an unlimited number of piggyback (third party) pixels to each advertiser pixel. When the advertiser pixel is fired it needs to load the piggyback pixels that are bound to it. The appropriate piggyback pixel will then be fired based on the cookies that were set by the third party (e.g. Google).