I have a requirement to dynamically add flash elements into a page and have FSCommand function properly.

FSCommand is the primary method that Flash gives a programmer to execute scripts within the parent browser.

This requires some shim code to be added as a listener. This listens for script calls from Flash.

According to the Macromedia examples the listener shim must be created using VBScript. So if my flash object has an id of "flashBufferingPlayer" I would require the following VBScript code that could then do a 'call' out to JavaScript.

<script language='vbscript'>
Sub flashBufferingPlayer_FSCommand(ByVal command, ByVal args)
   call flashBufferingPlayer_DoFSCommand(command, args)
end sub
</script>

Even though Macromedia have examples that use pure JavaScript they don't seem to work.

So at first glance it seems that the listener must be VBScript.

But there is a serious issue with adding both JavaScript and VBScript dynamically after document.onload is triggered

• Adding script via innerHTML does not work. Testcase.
• Using document.createElement appendChild does not work.
• Using document.write creates a new document.

Luckily Macromedia is wrong - the following Pure JavaScript will work.

<SCRIPT event=FSCommand(command,args) for=flashBufferingPlayer>
   flashBufferingPlayer_DoFSCommand(command, args);
</SCRIPT>

And doubly lucky, a script event listener will work when dynamically added using innerHTML.

Sadly it seems that nothing like

flashBufferingPlayer.onfscommand = flashBufferingPlayer_DoFSCommand;

is available.