.flv will not play in Firefox

I have two pages on my site, both with videos inserted through dreamweaver. One plays wonderfully in all browsers. The other plays in all but firefox. Just a white screen.
I have tweaked and reinstalled on and on, but morbidity, despair and desperation is setting in.
Help would be great.
Hob

Here be the nasty little critter.
http://www.youarehavinagiraffe.info/thecanals.htm
I you try Safari, Opera etc.......
Cheers
Hob

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.flv will not play in Firefox

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