Captcha replacement - ajax

I stumbled upon http://www.kettletime.com.au/chance where the user needs to drag and drop a box with a number into another box to prove that he is human.
How do you implement this? Any free library to do this?
Thanks

It appears to be this one: http://www.webdesignbeach.com/beachbar/ajax-fancy-captcha-jquery-plugin.
How do you implement this?
Of course, you can implement the functionality on your own (see other answers), but this plug-in seems to be highly configurable :)
Any free library to do this?
Yup, see link above.

I suggest using jQuery library with jquery UI official plug-in.
Here is a demo and code:
http://jqueryui.com/demos/droppable/

You should take a look at JqueryUI. The have a direct drag and drop implementation.
http://jqueryui.com/demos/draggable/

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EDIT
Go for a look over here
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thanks for your support!
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http://demos.telerik.com/aspnet-ajax/dropdownlist/examples/overview/defaultcs.aspx
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