Flash has no color management. You need to bring in your images with their profile to ensure color consistency. A good way to do this is to assign the profile in Photoshop(Edit Menu--> Assign Profile) to the image and then import into Flash. Most of the time if you use Adobe RGB 1998 for web images, when you save for web, the colors get desaturated. However, if you use the sRGB profile, the colors are preserved when you choose save for web and import into Flash.
Hope that helps!
Evo