With LaTeX

• With the help of ps2img (By Kumagai), formula of can be displayed.

  Standard deviation:

  Enclose formula with `span class="eqn"'.

   <p>Standard deviation:
   <span class="eqn" mag="2">
    \sqrt{\sum(x_i-\bar{x})^2 \over{n-1}}
  </span>
   </p>
  

`mag' is magnification unit.