In the changelog.txt for Superfish it is said that in 1.4.2: attach everything to jQuery.fn.superfish to clean up jQuery namespace
So I made the following changes in supposition.js v0.2 and it seems to work fine with Superfish 1.4.8 and Supersubs: line 57: var o = $.superfish.o[this.serial]; /* get this menu's options */ var o = $.fn.superfish.o[this.serial]; /* get this menu's options */ line 64: $.extend($.superfish.o[this.serial],{ $.extend($.fn.superfish.o[this.serial],{ Cheers,