Bookmarklet for Wikipedia, replacing PNGs on the fly

wikipedia2mj.js

javascript:(function(){ var s=document.createElement('script');s.setAttribute('src','ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"');document.getElementsByTagName('body')[0].appendChild(s); $('img.tex').wrap('<span class="MathJax_Preview" />');$('.MathJax_Preview').after(function() {  tex = $(this).find('img').attr("alt");  return " <script type='math/tex'>" + tex + "</" + "script>" ;});$.getScript('https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS-MML_HTMLorMML');})()

Still missing: Wikipedia's texvc macros.

Are texvc macros different to the images displayed by default on wikipedia? It looks like they've just got the class 'tex', with the TeX stored in the 'alt' attribute.

@christianp, that's true for almost all websites which use maths images.

If a script was made for that then it would work everywhere, not just on Wikipedia.