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In this particular website, when you hover your mouse over a particular region, it displays something that is clickable. I know of tool tips, but in my experience, I have only used tool tips to show static text, not click able html text. http://www.cry.org/projects/projects.html

What technology do you think is being used here? Also, is this a tool tip?

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These aren't tooltips like those created with a title attribute in HTML. This is normally called a "rich tooltip" and is done using an absolutely or relatively positioned HTML element with an appropriate z-index if required, so full HTML markup can be used. While it could be done with CSS alone in modern browsers, Javascript is most often used to show and hide the element, sometimes with a fade effect.

Many Javascript UI libraries implement similar functionality, see e.g. this JQuery UI demo, dijit.Tooltip, etc.

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Thanks. But in the jquery example, as soon as I go over the tooltip, it vanishes. – Kaushik Apr 29 '12 at 7:09
I find that it doesn't if you click in the field first (so that it gains focus). That tooltip seems to be a work in progress, see wiki.jqueryui.com/w/page/12138112/Tooltip for discussion & documentation. – Thorn Apr 29 '12 at 7:14

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