Take a look around for blog or gueskbook tutorials. They will have more info on the actual coding rather than full blown scripts.
The basics are pretty easy. You have a table for the articles and these articles have unique IDs.
You can create a new table for comments.
When you insert the comment you give it a foreign key. This will be the ID of the article.
You can then select all the comments for the required article.
Dreamweaver can do this with it's inbuilt scripts.
All the best
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