if(navigator.appVersion.charAt(0) >=3){
  var btnimg = new Array();

  for( i = 0 ; i < 22 ; i++ ){
    btnimg[i] = new Image();
  }

  btnimg[0].src=  "images/menu01a.gif";
  btnimg[1].src=  "images/menu01b.gif";
  btnimg[2].src=  "images/menu02a.gif";
  btnimg[3].src=  "images/menu02b.gif";
  btnimg[4].src=  "images/menu03a.gif";
  btnimg[5].src=  "images/menu03b.gif";
  btnimg[6].src=  "images/menu04a.gif";
  btnimg[7].src=  "images/menu04b.gif";
  btnimg[8].src=  "images/menu05a.gif";
  btnimg[9].src=  "images/menu05b.gif";
  btnimg[10].src=  "images/menu06a.gif";
  btnimg[11].src=  "images/menu06b.gif";
  btnimg[12].src=  "images/menu07a.gif";
  btnimg[13].src=  "images/menu07b.gif";
  btnimg[14].src=  "images/menu08a.gif";
  btnimg[15].src=  "images/menu08b.gif";
  btnimg[16].src=  "images/menu09a.gif";
  btnimg[17].src=  "images/menu09b.gif";
  btnimg[18].src=  "images/menu10a.gif";
  btnimg[19].src=  "images/menu10b.gif";
  btnimg[20].src=  "images/menu11a.gif";
  btnimg[21].src=  "images/menu11b.gif";
}

function paintBtn(dim, cnt){
  if(navigator.appVersion.charAt(0) >= 3 ){
    document.images[dim].src=btnimg[cnt].src;
  }
}