The solution you've linked to is based on flash and ajax. The point is that there are quite a lot of people surfing the web with disabled javascript, not installed flash plugin or security programs (virus-scanners, malware-scanners) disabling file-access.
While this is no harm for some "eye-candy" it can harm the usability if you need this prerequisites for crucial functions.
There might be such a hack or you may find somebody integrating such a solution to vB, but there will be definitly some unsatisfied users.. that's my point of view.
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