Actually, how about using forkosh.com's implementation (<- see link)? It doesn't require any JavaScript, and works well, for example:



In fact, what we might desire, is just the installation of cgi-bin script on DW, so people can simply include LaTeX like this:

<img src="/cgi-bin/mimetex.cgi?
    x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}">

Then, it just suffices to define a new tag, something like <math></math> that passes the expression into the CGI script, and you get math formulae as nice images...

Installation instructions are here.