The instruction handouts for ASTR 302 use PNG graphics for
nice-looking antialiased equations. However, older versions of
Netscape and Internet Explorer (among others) do not include support
for PNG files. To view the handouts with all graphics, you will need
versions 4 or later of Internet Explorer or Netscape (or equivalent).
You can download
both freely from Netscape or The Evil Empire.
Sorry, but the only alternative is using crappy blocky .gif
files. It's just not worth it. :)