I just checked out the code behind - this is a flash animation using the regular Java Script to get the show started.
If your Flash gets updates at a regular frequency, your firewall may notice the new version of flash on your PC and a plugin requesting access to that "unknown" software.
There is absolutely nothing wrong with it. Refer to Google searching for the "naked men clock".
But sure better to be suspicious than to trust all times.
regards
Torsten