ProStores SSML integration

SSML stands for Store Sense Markup Language and is the proprietary markup for the eBay ProStores e-commerce system. As ProStores runs on a divided header/footer template system, Headers and footers are loaded on each page with the content loaded between them, so you can run into security certificate warnings on the checkout pages if your links aren't relative or secure (https) on those pages.

This fix, by a user in our forum called forsports, uses SSML conditional statements to load the non-secure version on non-secure pages and the secure version on secure pages.