if(navigator.appVersion.charAt(0) >= "3")
{
  img = new Array();
  img[1] = new Image; img[1].src = "menu/menu_01.gif";
  img[2] = new Image; img[2].src = "menu/menu_02.gif";
  img[3] = new Image; img[3].src = "menu/menu_03.gif";
  img[4] = new Image; img[4].src = "menu/menu_04.gif";
  img[5] = new Image; img[5].src = "menu/menu_05.gif";
  img[6] = new Image; img[6].src = "menu/menu_06.gif";
  img[7] = new Image; img[7].src = "link_menu/link_menu_01.gif";
  img[8] = new Image; img[8].src = "link_menu/link_menu_02.gif";
  img[9] = new Image; img[9].src = "link_menu/link_menu_03.gif";
  img[10] = new Image; img[10].src = "link_menu/link_menu_04.gif";
  img[11] = new Image; img[11].src = "link_menu/link_menu_05.gif";
  img[12] = new Image; img[12].src = "link_menu/link_menu_06.gif";
  img[13] = new Image; img[13].src = "link_menu/link_menu_07.gif";
  img[14] = new Image; img[14].src = "link_menu/link_menu_08.gif";
  img[15] = new Image; img[15].src = "link_menu/link_menu_09.gif";
  img[16] = new Image; img[16].src = "link_menu/link_menu_10.gif";
  img[17] = new Image; img[17].src = "link_menu/link_menu_11.gif";
  img[18] = new Image; img[18].src = "link_menu/link_menu_12.gif";
  img[19] = new Image; img[19].src = "link_menu/link_menu_13.gif";
  img[20] = new Image; img[20].src = "link_menu/link_menu_14.gif";
  img[21] = new Image; img[21].src = "link_menu/link_menu_15.gif";
  img[22] = new Image; img[22].src = "link_menu/link_menu_16.gif";
  img[23] = new Image; img[23].src = "link_menu/link_menu_17.gif";
  img[24] = new Image; img[24].src = "link_menu/link_menu_18.gif";
  img[25] = new Image; img[25].src = "link_menu/link_menu_19.gif";
  img[26] = new Image; img[26].src = "link_menu/link_menu_20.gif";
  img[27] = new Image; img[27].src = "link_menu/link_menu_21.gif";
}
function chg_img(a,b){
  if(navigator.appVersion.charAt(0) >= "3"){
    document.images[a].src=img[b].src;
  }
}