I think the film you're talking about is the Chroncles of Narnia: The Lion, The Witch, and the Wardrobe...
I used to like the cartoon version when I was little, so I watched it, and, all in all, it's not that bad...
But not exactly something I'd try to sell you on, either...
Rent it, or catch it On Demand or something. It's not really personal library worthy unless you're really into the novels.