Storing SWFObject.addVariable() vars globally in AS3 · Aug 23, 08:46 PM
Embedding variables with SWFObject is easy. In previous versions of Actionscript all the variables registered with the SWFObject were globally available within the SWF. From any class or object, you could call _root.theVariableName and access that variable.
However, moving to AS3, things are a little different. The SWFObject still embeds FlashPlayer 9 content without a problem – the SWF is properly embedded into the HTML and all the variables and parameters passed to the SWFObject are registered with the SWF. The only difference in AS3 is that these variables are not automatically available throughout your FLA.
☆ Jonathan Greene