To view the maths on a few of the notes pages with Internet Explorer 5.5 or later, you may need a plugin such as Design Science's MathPlayer.
To install MathPlayer, click here:
For Firefox you may need to install some extra fonts. See here. To test if you need them click here.
If some symbols look wrong in the PowerPoints you may need to install some extra fonts.
For Windows you can download the TrueType fonts by clicking here.