Making Flash Taking the Size of Browser

Preparations:

Create a new flash file (ActionScript 2.0) and save it as test.fla in this case.

Step 1:

Proceed on to File > Publish Settings. Make sure the HTML type is checked.

Step 2:

Select Dimensions > Percent and enter 100 for both Width and Height.

Step 3:

Select Scale > No Scale

Step 4:

Click on Publish and generate 2 files, test.swf and test.html.

Step 5:

Open up test.html with any text editor and include supplied CSS codes within head tag. That's all!