technique name required please

Doubt it has an official name, but something along the lines of Dynamic JavaScript Tabs. You can find a free script and example here. Basically just involves some fancy JavaScript and a bunch of <div> tags to hold your content.
 
If the data is already on the page but hidden, it's just "DOM Manipulation" achieved with one of many freely available libraries like MooTools, jQuery, or even the BBC's own library that they released recently called Glow. You're basically using JS to hide and show stuff.

If it's fetching the data from elsewhere when you click it, that's often referred to as "AJAX".
 
Probaly just hiding divs with js, something like,

Code:
document.getElementById('divname').style.visibility = 'visible';
document.getElementById('divname').style.visibility = 'hidden';
 
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