The background color (Stage color) of a SWF file can be set to transparent. The background color or image of the HTML page that contains the SWF file shows through. This technique allows layering of SWF content with DHTML (Dynamic HTML) content.
Not every web browser handles transparency in the same way. Be sure to test your SWF file in all browsers that you want to enable your audience to use. Most Linux browsers do not support Animate transparency. This table lists several browsers that support transparency.
Using the Publish Settings in Animate
The HTML for a SWF file can be created using the Publish Settings feature in Animate. The Publish Settings dialog box provides an option to affect the WMODE setting. The options selected in the Publish Settings are added to the HTML source code automatically.
Using the Properties panel in Dreamweaver
Editing the HTML code manually
To edit an existing HTML page, add the WMODE parameters to the HTML code.
Add the following parameter to the OBJECT tag:
<param name="wmode" value="transparent">
For more information about editing HTML tags manually for SWF content, see Object Tag Syntax.