Step 1: Create a New Flash CS3 ActionScript 3.0 Document

Let's start by creating a new Flash CS3 Document. To do this:

• Open Flash CS3 Professional
• Create a new file by clicking
  File > New
  Choose Flash File (ActionScript 3.0)
  
• Specify the dimensions of the Flash File
  Modify > Document
  770 px Width
  400 px height

Save the Flash File

• File > Save
• Give it a name e.g website.fla and save it in a folder of your choice on your computer.

Mast

• Rename the layer on the timeline to ‘Mast’.
• Create a red rectangle using the  rectangle shape tool  for the masthead and convert it to a  graphic symbol named ‘rectangle’
  

Next: Step 2: Buttons in Flash CS3