Sorry fewwords, I copied the code off the net again, rather than the website code. It does point to ..\asets\snow.gif rather than the snow.gif which is the straight code. I admit I'm stumped. I even bought my javascript programmer mate a beer on Saturday night & he can't sus it out either!
My understanding is that javascript runs in the browser as opposed to anywhere else, so one of the pitfalls is broswer settings. Mebbes I shal just get a flash movie going.
It is a cheesy effect, but it makes me feel all christmassy & I do hate being defeated by confusers