Apart from stripping the doors using a paint stripper, or taking them of and having them professionally stripped (not always advisable).You could always grain them a lighter colour. If you want some instructions let me have your email and I will send you some details on how to do this.
Cheers Rigga, if I'm thinking the same as you're suggesting I've done something similar a few years ago - I've still got the graining tool around somewhere!
I've decided to wait for a bit of fine weather over a weekend, take a door out back and attack it with a belt sander and see what happens, tho' will a take a bit of patience with the details. Think I'll try this first.
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