Make sure you do not fuss him when you leave...i.e. say goodbye, cuddles, strokes etc. Just go out. Do the same when you come back...no fussing to say hello, I know it's hard to do, but ignore him for at least 10 mins. Otherwise you will just encourage the behaviour. He could also be picking up on your stress/guilt about leaving him...act as normal as you can! If you continue on the vein he should soon learn that there is nothing to stress about.
Good Luck!

Breda

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A dog is not intelligent. Never trust an animal that's surprised by its own farts.