I use Google Sites for most of my course related materials, since it is part of university’s Google Mail account. MathJax – a system for writing math on the web – does not work with Google Sites, since MathJax uses Javascript.  After some time googling this issue, I found that Google has its own way to enter math. For example, the following  math equation is produced by the HTML snippet after it.

<img src=”http://www.google.com/chart?cht=tx&chf=bg,s,FFFFFF00&chco=000000&chl=e^z=\sum^{\infty}_{n=0}\frac{z^n}{n!}” />

Click here  for explanation of the code, and more examples. The equations can always be edited on the site, unlike an equation image.