Using this thoroughly explained, detailed flash lesson, you will see how to create simple mouse rollover photo effect. To create this lesson, you have to use action script code. Using this lesson, You will also learn how to import any photo into a flash stage, how to convert it into a Button Symbol, how to create instance name and much much more! You can use this rollover effect for any web button, or for some web banner.
Example:
Step 1
First, find any photo which you like to use for this lesson.
Step 2
Press Ctrl+J key on the keyboard (Document Properties) and set the dimensions of your doucment as the dimensions of photo.
Step 3
Call the current layer photo. Double-click on its default name (Layer 1) to change it. Press Enter once you have typed in the new name!
Step 4
Choose now File > Import > Import to stage (Ctrl+R) and import any photo into a flash stage. While the photo is still selected, go to the Align Panel (Ctrl+K) and do the following:
1. Make sure that the Align/Distribute to Stage button is turned on,
2. Click on the Align horizontal center button and
3. Click the Align vertical center button.

Step 5
While the photo is still selected, hit F8 key (Convert to Symbol) to convert it into a Button Symbol.

Step 6
While the button is still selected, go to the Properties Panel below the stage. On the left side, You will find the Instance name input field there. Call this Movie Clip photo. See the picture below!

Step 7
Select the Selection Tool (V) and click once on the button to select it. After that, go to the AS panel (F9) and enter this code inside the actions panel:
on (rollOver) {
_alpha = 350
}
on (rollOut) {
_alpha = 170
}
Step 8
Select now the first frame and go to the AS panel (F9). Then, enter this code inside the actions panel:
_root.photo._alpha = 30
Test your Movie (Ctrl+Enter).
Have a nice day!
Download source file (.fla)