Indesign 5.5 epub properties

I have this simple script to export an epub from a book file
That works>
But… I can’t find the syntax to attach some properties to it
I have the impression that it works different then with export pdf

Here’s my script


tell application "Adobe InDesign CS5.5"
	activate
	set user interaction level of script preferences to never interact
	export active book format EPUB to "Mirror:Users:sysadmin:Desktop:TESTEN:tester.epub"	
end tell

Can anyone help?