  <!--
  /*画像のプレロード*/
  image = new Array();
  //画像のＵＲＬを入れる
  image[0] = new Image();
  image[0].src = "image/bt_annai_o.gif";         //マウスが離れた時の画像
  image[1] = new Image();
  image[1].src = "image/bt_annai.gif";         //マウスが乗ったときの画像
  image[2] = new Image();
  image[2].src = "image/bt_toku_o.gif";
  image[3] = new Image();
  image[3].src = "image/bt_toku.gif";
  image[4] = new Image();
  image[4].src = "image/bt_course_o.gif";
  image[5] = new Image();
  image[5].src = "image/bt_course.gif";
  image[6] = new Image();
  image[6].src = "image/bt_teach_o.gif";
  image[7] = new Image();
  image[7].src = "image/bt_teach.gif";
  image[8] = new Image();
  image[8].src = "image/bt_kouryu_o.gif";
  image[9] = new Image();
  image[9].src = "image/bt_kouryu.gif";
  image[10] = new Image();
  image[10].src = "image/bt_bbs_o.gif";
  image[11] = new Image();
  image[11].src = "image/bt_bbs.gif";
  image[12] = new Image();
  image[12].src = "image/bt_inc_o.gif";
  image[13] = new Image();
  image[13].src = "image/bt_inc.gif";
  image[14] = new Image();
  image[14].src = "image/bt_top_o.gif";
  image[15] = new Image();
  image[15].src = "image/bt_top.gif";
  image[16] = new Image();
  image[16].src = "image/bt_std_o.gif";
  image[17] = new Image();
  image[17].src = "image/bt_std.gif";
  image[18] = new Image();
  image[18].src = "image/bt_home_o.gif";
  image[19] = new Image();
  image[19].src = "image/bt_home.gif";



  //マウスが乗った時
  function mouse_on(){
    document.myImg.src = image[1].src;
  }
  function mouse_on2(){
    document.myImg2.src = image[3].src;
  }
  function mouse_on3(){
    document.myImg3.src = image[5].src;
  }
  function mouse_on4(){
    document.myImg4.src = image[7].src;
  }
  function mouse_on5(){
    document.myImg5.src = image[9].src;
  }
  function mouse_on6(){
    document.myImg6.src = image[11].src;
  }
  function mouse_on7(){
    document.myImg7.src = image[13].src;
  }
  function mouse_on8(){
    document.myImg8.src = image[15].src;
  }
  function mouse_on9(){
    document.myImg9.src = image[17].src;
  }
  function mouse_on10(){
    document.myImg10.src = image[19].src;
  }
  //マウスが離れた時
  function mouse_off(){
    document.myImg.src = image[0].src;
  }
  function mouse_off2(){
    document.myImg2.src = image[2].src;
  }
  function mouse_off3(){
    document.myImg3.src = image[4].src;
  }
  function mouse_off4(){
    document.myImg4.src = image[6].src;
}
  function mouse_off5(){
    document.myImg5.src = image[8].src;
  }
  function mouse_off6(){
    document.myImg6.src = image[10].src;
  }
  function mouse_off7(){
    document.myImg7.src = image[12].src;
  }
  function mouse_off8(){
    document.myImg8.src = image[14].src;
  }
  function mouse_off9(){
    document.myImg9.src = image[16].src;
  }
  function mouse_off10(){
    document.myImg10.src = image[18].src;
  }
  //-->