Does anyone knows how to do a rating system. In fact, I have already build it but I don't know how to merge it with the articles that have to rated. Each article should have a unique rate. It's like on youtube. If any one knows how to do it or can give a few advice. I'll be grateful.thanks in advance.

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Can't be done with just HTML.

Needs a server side code

You gonna need some coding skill for this pal.

You need a page or an ajax handler that accepts ratings.
Then on the article page each star should either pass the rating to the rating page or pass it to the ajax system which then sends it to the server.
The server needs to store the ratings in a separate table in the database, where it matches the articleID to the rating (and also possible a userid or ipaddress to prevent abuse of the rating system).

Then you can either calculate the ratings dynamically for each article by loading all the ratings for that articleid and averaging them, or (if a page has multiple articles in it and calculating them dynamically slows it down) you can have a serverside script run once a day or once an hour or whatever that goes through the database and calculates the current average rating for all articles and stores that directly in the article table as an extra field (avgrating or whatever). Then it can be loaded with all the normal article data and doesn't require any dynamic calculation.

If a lot of that didn't make sense to you, then you're probably over your head and should hire someone else to do it =)
If you're decent at writing serverside code that interacts with your database system, then have at it and ask if you have any specific questions or problems along the way =)

Personally I suggest you check out wordpress. Wordpress has this type of feature which you can easily add in with a single click of a button

Yap in wordpress you can do that thing.You can optimize wordpress very cool,you even don't know that is a wordpress.
Chill

JavaScript is probably the easiest way to do this. You would also have to store the values in the database to compute the average amount of stars. A Google search might show a tutorial.