Since my shopping cart software does not come with a search feature, the only way I can do a product search (with photos) on my site is to use Google Product Search with the "SITE:" parameter. Is it possible to differentiate Product Search hits on a global level (person goes to google product search and types something in and clicks on your link) vs hits sent FROM YOUR SITE to Google Product Search using the "site:mysite.com" parameter? Is there something else I can pass it that will make a click on a resulting product look different in the stats from a generic Google Product Search?