AS2 recursively root iteration

function iterComponents() {
	var root:Object  = arguments[0];
	var f:Function   = arguments[1];
	var cache:Object = arguments[2];

	if(!cache)
		cache = new Object();  // initialize cache
	cache[root] = true;  // mark as visited
	for(var obj in root) {
		// visit unvisited components
		if(!cache[root[obj]]) {
			f(root[obj]);
			iterComponents(root[obj], f, cache);
		}
	}
}

iterComponents(_level0, function(o){ trace(o) });