http://www.catimini.com/themes/catimini/js/tools/picturefill.js?build=37
http://www.kitchentrotter.com/themes/kt/js/tools/picturefill.js?v=55
https://paulcomp.com/wp-content/themes/paulcomp/js/pictureFill.js?ver=20130115
http://builtbyswift.com/wp-content/themes/builtbyswift/js/pictureFill.js?ver=20130115