From http://www.w3schools.com (Copyright Refsnes Data)

Flash Button 2

Example

In this example you will learn how to create your own button and add a URL to it so it becomes a link.

Step 1
Choose Insert > New Symbol from the top menu.

Step 2
Name the symbol "button", choose Button from the Behavior list and click OK. In the Timeline area, you will now see the four states of a button: up, over, down, hit.

Step 3
Select the Rectangle tool, pick a light red Fill Color and draw a rectangle in the work area.

Step 4
Select the Text tool, pick a dark Fill Color and write "Click Me" over the rectangle.

Step 5
Select the Arrow tool and place the text in the middle of the rectangle.

Step 6
Add a keyframe to the Over State in the Timeline. The Over State indicates what should happen when you mouse over the button.

Step 7
Select the Rectangle, change the Fill color to a light green.

Step 8
Choose Edit > Edit Movie to go back to the movie.

Step 9
Choose Window > Library to locate the button. Drag the button into the work area.

Step 10
Right click on the image. Choose Actions from the pop-up menu.

Step 11
In the Object Actions box click on the + sign. Choose Basic Actions > Get URL.

Step 12
Enter a full URL in the URL field (like http://www.w3schools.com).

Step 13
Choose target in the Window field. Close the Object Actions box.

Step 14
Choose Control > Test Movie from the top menu to test your Flash movie.