Good one to remember to replace egg in a recipe for any reason. Using flax seeds does the same thing as egg in a recipe! Go vegan ingenuity. The following is copied from a comment on my whole food life blog:
All you do is 1 T flax meal + 3 T warm water.
Whisk together and place in the fridge for a minute or two. It will become gummy like a real egg. Perfect for those who have allergies.