jsMath
jsMath itself is working, see:
http://www.server-sky.com/jsmathdir/test/index-images.html
http://www.server-sky.com/jsmathdir/test/index.html
http://www.launchloop.com/jsmathdir/test/index-images.html
http://www.launchloop.com/jsmathdir/test/index.html
see http://wiki.themel.com/PublicTestPage
note that some markers do not work, and some do. Use what works!
Here are some math equations using those markers. Some inline math: \sqrt{1-x^2} or \(ax^2+bx+c\), and some displayed math:
\int {1\over x}\,dx = \ln(x)+C
and
\[\sum_{i=1}^n i = {n(n+1)\over 2}.\]