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thanks for the answer.

There's lot of different languages for front-ent development: JQuery, Ajax, JavaScript, HTML, CSS, etc etc...

What I would like to know is what languages are really important to master for someone trying to design a website.

I'd have to echo the XHTML/CSS suggestion. Becoming proficient in just those two allow you to make robust, accessible sites, limited only by your creativity (and perhaps your client's requests). It might help also to study HTML5. After these, devote some time to JavaScript.

With these you'll have a nice little front-end development toolkit.

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