Online videos stopped working

My MacBook was recently autoupdated, which caused some online videos to stop working. The page appears blank, as if no player is loaded. Could anybody help?

My OS is 10.7.3

Processor 2.66 GHz

Memory 4GB

My Safari version is 5.1.3

An example URL for videos that do not work:

www.cambridge.org/uk/stm/feneck/TEEchapter4.asp

Thanks a lot.

Sam