Fix python for Blender 2.58

	modified:   2.58/scripts/addons/io_mesh_threejs/__init__.py

utils/exporters/blender/2.58/scripts/addons/io_mesh_threejs/__init__.py

@@ -45,7 +45,7 @@ if "bpy" in locals():
 
 import bpy
 from bpy.props import *
-from io_utils import ExportHelper, ImportHelper
+from bpy_extras.io_utils import ExportHelper, ImportHelper
 
 # ################################################################
 # Custom properties