I hope everyone knows what QR codes are and how to use them? Who is not in the subject - you here . In general, this small plugin for jQuery can display QR codes for links on a page. This can be useful where you need to transfer a link to a mobile device, for example, a link to a mobile version of the site - there is no need to interrupt links from the browser to your phone anymore, take a photo and run;)
The plugin is quite simple, based on the ColorTip plugin for tooltips, js-uri for relative links and Google Chart API for QR codes;)