aaahhhmmm>??? new decals? I can help you in that department.

What kind of material are your sails? You can probably get away with using some type of RTV silicon and paste them back on. Make sure that if you choose this route, you apply a very small ammount around the edges of the decals and smooth them out with your fingers. Should work good, if let dry for 24~48 hours.

Good luck.

edit: and what Jake said as well! Good recomendation in his post.