How add folder item to tree

Suite and Optimus Suite 5
#1

How add folder item to tree?
code:tree.insertNewItem(pid, id, “folderNode”, null, “folderClosed.gif”, “folderClosed.gif”, “folderOpen.gif”, “SELECT”);
but Icons incorrect.

#2

but Icons incorrect.

What icons are incorrect ? insertNewItem method looks correct.

Please check that image path is correct.