In order to see text that is matched in size to embedded math (which is handled using images), it is necessary to use fonts which are larger than the default font sizes in most Web browsers.
For example, I use the following settings:
In Mozilla or Netscape Navigator (any platform), go to Edit/Preferences/Fonts and select at least 20 pixels for proportional fonts (Adobe Times), and at least 18 pixels for the monospace font (Adobe Courier).
In Windows XP, go to Start/ControlPanel/Display/Appearance and select 'Large Fonts' in the 'Font size' pop-up menu. (For Windows 2000 or 98, select 'Windows Classic (large)'.) This makes things look better in Internet Explorer.
These larger fonts will better match the enlarged math images (which are better anti-aliased). They are also easier to read if you are using a high-resolution monitor (mine is 105 dots per inch).