+1  A: 

Is this Flash CS4 Professional? Flash CS3 Professional? Flex 3.3 SDK? Flex 4 SDK? If you are using some version of Flash, then you can just embed the image in your Flash (*.fla) file. If you are using some version of Flex, you can use the [Embed(source="path/to/source/image.png")] to embed the image. See this link.

Michael Aaron Safyan
A: 

This question is actually deceivingly simple in its answer. Download Flash CS4 Professional, import the .png you want to convert to .swf onto the board and just export it as a .swf. I guess the reason I couldn't find an answer to this problem was because it was so trivial.

Javed Ahamed