Not sure what to tell you because it works for me. I cut-and-pasted your code exactly into the text of the clock cell and the flash widget came right up.
Interestingly, I tried this outside of the TD in a test web page, and then opened it with IE, Firefox, and Chrome. All worked except IE. No idea why IE wouldn't load the flash object. No error or anything, just the typical red "X" of a broken image.