The name of the plugin is lazy-loading jquery image In fact, well known for a long long time plugin, but only now have the opportunity to explore it a bit. To view this jquery plugin to do what, please visit visit http://gialai.net.vn I do not know the site they use the library or what they develop, but this plugin is similar to the site. Look for photos when you pull into Nhe scrollbar, when it appears it also means that it starts to load, so make a pretty good performance and good inspiration, image is loaded each one should also mean is to reduce the server load and the load on your site that is also improved. Link : http://www.congnghemoigialai.vn/thiet-ke-website-gia-re-gia-lai/thu-thuat-seo---danh-cho-webmaster/plugin-jquery-lazyload---load-tung-anh-tren-trang-web.html