if(navigator.appVersion.charAt(0) >=3) {
  img = new Array();
  img[010] = new Image();  img[010].src = "img/b_main_1.gif"; 
  img[011] = new Image();  img[011].src = "img/b_main_1on.gif"; 
  img[020] = new Image();  img[020].src = "img/b_main_2.gif"; 
  img[021] = new Image();  img[021].src = "img/b_main_2on.gif"; 
  img[030] = new Image();  img[030].src = "img/b_main_3.gif"; 
  img[031] = new Image();  img[031].src = "img/b_main_3on.gif"; 
  img[040] = new Image();  img[040].src = "img/b_main_4.gif"; 
  img[041] = new Image();  img[041].src = "img/b_main_4on.gif"; 
  img[050] = new Image();  img[050].src = "img/b_main_5.gif"; 
  img[051] = new Image();  img[051].src = "img/b_main_5on.gif"; 
  img[060] = new Image();  img[060].src = "img/b_main_6.gif"; 
  img[061] = new Image();  img[061].src = "img/b_main_6on.gif"; 
  img[070] = new Image();  img[070].src = "img/b_main_7.gif"; 
  img[071] = new Image();  img[071].src = "img/b_main_7on.gif"; 
  
}

function _in(nam, num) {
  if(navigator.appVersion.charAt(0) >=3) {
  document.images[nam].src = img[num].src;
  }
}
function _out(nam, num) {
  document.images[nam].src = img[num].src;
}