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How can I enable drag and drop on a web page and have dynamic elements?

Hi experts

What programming technology would I need in order to add drag and drop capability to a web page? I'm also interested in areas that auto expand depending on user interaction - think Facebook, when expanding the comments on a status update - the page elongates with smooth scrolling to accomodate the new information.

I'm proficient with PHP and know a little Javascript and HTML. Can I achieve it with these two technologies or would I need something like HTML5 and CSS3?

Thanks in advance
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As another example of the expanding areas, of course, is the Experts Exchange site itself. When you click on 'my open questions', the box smoothly opens up to reveal more information.
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Looks like just what I'm looking for, thanks!