Scratch

i have a project i have to work on but ive run across a problem. i imported pictures of myself into it. when they appeared they were to big so i made them smaller, but then all of a sudden holes appeared in my hair. i tried fixing this in the editor but the holes dont appear there. i tried painting over them with the paintbrush tool, and that worked, but my hair is the same color as the outline of the paintbrush tool so i cant see where im painting and it is terribly time consuming, it could take several hours. i also noticed that if i made the pictures bigger they disappeared but if it got any smaller they would re appear. in case this helps you figure out what the problem is, i edited the pictures in fireworks and removed the background using the polygon lasso tool. im also using a windows 7. any help will be extremely appreciated.