Learn how to make a great image revaling mask effect in Macromedia Flash in just a few easy steps.

1.
Start by importing the image you want to add this effect to.
file -> import -> import to stage and locate the image file.

2.
Now make a new layer in the layers panel and place it above the first layer, name it mask.
Create an ovel on the stage, right click and convert it to a movie clip.
Then go to the properties panel and name it a.

3.
Click somewhere on the stage, go to the actionscript panel, and add the following code.

startDrag("a", true);

4.
Now in the layers panel right click the mask layer and choose mask so it masks over the image.

Test your flash movie and see the effect when you drag the oval over the image.