Placeholder plugin scripting reference

In the sample html file, sample08.html, there is a button that inserts html into the document. I'm trying to add another button that inserts in a place holder into the document. I have correctly modified the code to include the plugin and I can insert the place holder using setHTML(), but I can't get a reference to FCKPlaceHolders in order to call functions on it.

Can anyone show me how to get a reference to FCKPlaceHolders?


*Note: Here's how fck_placeholder.html gets it's reference:

var oEditor = window.parent.InnerDialogLoaded() ;
var FCKLang = oEditor.FCKLang ;
var FCKPlaceholders = oEditor.FCKPlaceholders ;


Thanks,
Scott