Flashlight

Google will help lots.. but here's a simple example.

Make a new project.

Add your shark image.

Make a new layer and then draw an oval shape in it. Select the oval and turn it into a movie clip - centered reg point.

Give it an instance name of 'light'

Right click it's layer name (Layer 2) in the timeline and select Mask

Now you should see only that part of the image under the mask

Make a new layer (Layer 3) and then click the Actions tab - enter this code, and then run the movie:

addEventListener(Event.ENTER_FRAME, update);

function update(e:Event):void

{

  light.x = mouseX;

  light.y = mouseY;

}