function ExtractBookmark(Bm, isRoot)
{
	// write a name of the bookmark	
        var Title = "";

	if (isRoot == false)
	{
		Title += Bm.name;
	}

	// process children
	if (Bm.children != null)
	{	
		for (var i = 0; i < Bm.children.length; i++)
		{	
			if (!(Title === "")) Title += "; " 
			Title += ExtractBookmark(Bm.children[i], false);
		}
	}
	return Title;
}

var root = this.bookmarkRoot;
event.value = ExtractBookmark(root, true);