Most of the HTML code for these pages was hand-crafted with care, compliant with DTD HTML 4.01. I used PC Mojo's HTML Web Page Color Guide to pick the background colors. I checked and formatted the HTML code with Dave Raggett's program tidy, and I checked links and such with Imagiware's Doctor HTML. You can have Doctor HTML check a (single) page by typing the URL below.
Finally, there's W3C's HTML validation service. You can validate this page by clicking on one of the icons at the very bottom of this page.
Note: There's a small chance that your browser can't display the images on this page, the reason being that they're png files, which aren't supported by all browsers. However, I decided to use them anyway because (a) there are compelling reasons to use png instead of gif and (b) you won't miss much if your browser ignores the images on this page.
In case you're interested, here are the templates and style sheets I'm using (click on the right mouse button (or hold down the shift key) in order to save the files):
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