Add new feature to my existing HTML5 Web App (leaflet, smarty based)

I run a website where people can find free public toilets all over the world ([login to view URL]). I now started to create a Web App to query my database using smartphones (see [login to view URL]). This already works fine! However, I now want you to add the rating functionality I already have on the website to the Web App. In detail: -Show ratings received so far on the detail page -Add possibility to rate each entry The Web App system uses leaflet and smarty technology.