Find a site that doesn't have frames and use the "view source" or "view code" commands in your browser. Beyond that, just trial and error.
In IE, it's "view" (on the bar at the top), then "source."
[shameless plug]
'Course you can always take a Website design course. I did and look what happened:
http://www.geocities.com/mark_a_brown/central.html) [/shameless plug]
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"The Beasts know much that we do not." -Ancient Jedi proverb