Display flash (swf) as background in html

If we have flash embedded in a html page. Usually, it will be placed on top of other div or other components. There is a way to display other thing on top of flash, that is by adding the parameter: wmode with value opaque. Example:

< name="wmode" value="opaque">


Or, there's a good library for embedding flash object to html by using SWFObject. It is located in here.