1. Open flash click "new flash document".
2. Open the page properties if its not already opened which it should be Window/Properties/Properties.
3. Change the background color to black.
4. Now you will choose and image you want to add the effect to. To do this you go to File/Import/Import to stage and then you browse for the image you want.
5. Now with your image on the stage select it and convert it to a symbol. Press (F8) and name it image.
6. On the timeline add a few frames as many as desired. i added 20. the way you do this is you go to the time line and on the frame you want to add you right click and then you click insert frames.
7. Now on frame 10 which is my middle frame press (F6) this will create a key frame and do the same on the last frame.
8. Now click on the middle key frame and then go back to your image select it and then go to filters.
9. Then click on the plus sign and click on blur.
10. Change the blur X: to 15 and the blur Y: to 15 as well and put the quality high.
11. Now go back to the time line and select the whole thing then right click and select create motion tween.
More Flash & Swish: 
