Expandable XML elements in XSL Stylesheet

How would I make XML tags expandable when you click on them (like when you view a raw XML file in IE) through an XSL stylesheet ?


Here is what I mean...


Main Item 1
-Sub Item
-Sub Item
-Sub Item
-Sub Item
-Sub Item

Main Item 2
-Sub Item
-Sub Item
-Sub Item

I have the XSL sheet all laid out, now i just want the "sub item" to expand and contract when you click on "main item".

Thank you