Masking

[zaknbou]

hi guys, i am a totally newbie that is trying to get his way into sketch up ,
i work into marketing in a beauty and cosmetic company and we are gonna launch
a new product in march 2008 (shampoo)
to the topic : i have the finished shampoo bottle jpeg pic , what i need to do is to have it into sketchup as a 3d ...what i was thinking is to insert it into sketchup as jpeg then mask it but i can't get to know how to use curved line to mask rounded corner , is there another way to do that ....
(sketch up pro on xp in work office )