menue1          (page_id=1,  parent=0 )
  menue1_1      (page_id=10, parent=1 )
  menue1_2      (page_id=11, parent=1 )
  menue1_3      (page_id=12, parent=1 )
    menue1_3_1  (page_id=15, parent=12)
menue2          (page_id=2,  parent=0 )
  menue2_1      (page_id=20, parent=2 )
  .
  .
  .