Advice needed>>Flash and MySQL image quality

Hi everybody, I am very frastrated with the image quality that php loads in the movie from db. I have db with several tables and one of the tables is called ‘images’ so php loads image from db into flash movie, the actual image size is i.e 400X200 and it loads in the movie as a thumb button, ( flash downsize the image to 100X80 and of course my image looses its quality and becomes very nasty image) so by presssing that thumb button it opens a new flash movie and loads the same image in its actual size which is good -quality.
what can you recommne dto fix my problem should I add another table for thumb pix?? just asking if u need sourse files with php script let me know. thank you very much.