They have a million and one of these. Usually called lightbox, thickbox, [insert word here]box. They have them for all frameworks.

My personal choice is jQuery, I have not used mootools before but I would recommend jQuery to any new js user. Its real easy to learn and there is a plugin for almost anything you need to do. I would avoid prototype/scriptulous as well as any others.

Also stated above was the use of ajax. I would recommend writting one in regular javascript (only about 20 lines) so that you really understand what is going on. Then when you implement it in mootools/jquery you will see how great and simple they have made it.

...IMO objects in js is generally overkill. In all my projects I have never had a need for creating my own javascript objects, i'm sure there are reasons just I have never used them.

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