if (document.images) {
  labelmenu_B1_off = new Image(); labelmenu_B1_off.src = "buttons/labelmenu_B1.gif"
  labelmenu_B1_over = new Image(); labelmenu_B1_over.src = "buttons/labelmenu_B1_over.gif"
  labelmenu_B2_off = new Image(); labelmenu_B2_off.src = "buttons/labelmenu_B2.gif"
  labelmenu_B2_over = new Image(); labelmenu_B2_over.src = "buttons/labelmenu_B2_over.gif"
  labelmenu_B3_off = new Image(); labelmenu_B3_off.src = "buttons/labelmenu_B3.gif"
  labelmenu_B3_over = new Image(); labelmenu_B3_over.src = "buttons/labelmenu_B3_over.gif"
  labelmenu_B4_off = new Image(); labelmenu_B4_off.src = "buttons/labelmenu_B4.gif"
  labelmenu_B4_over = new Image(); labelmenu_B4_over.src = "buttons/labelmenu_B4_over.gif"
  labelmenu_B5_off = new Image(); labelmenu_B5_off.src = "buttons/labelmenu_B5.gif"
  labelmenu_B5_over = new Image(); labelmenu_B5_over.src = "buttons/labelmenu_B5_over.gif"
  labelmenu_B6_off = new Image(); labelmenu_B6_off.src = "buttons/labelmenu_B6.gif"
  labelmenu_B6_over = new Image(); labelmenu_B6_over.src = "buttons/labelmenu_B6_over.gif"
}