//画像イメージ実体の生成
if(document.images){
  var menu_top_ovr    = new Image();
  var menu_top_off    = new Image();
  var menu_org_ovr    = new Image();
  var menu_org_off    = new Image();
  var menu_event_ovr  = new Image();
  var menu_event_off  = new Image();
  var menu_labo_ovr   = new Image();
  var menu_labo_off   = new Image();
  var menu_formula_ovr   = new Image();
  var menu_formula_off   = new Image();
  var menu_pub_ovr    = new Image();
  var menu_pub_off    = new Image();
  var menu_join_ovr   = new Image();
  var menu_join_off   = new Image();
  var menu_access_ovr = new Image();
  var menu_access_off = new Image();
  var menu_member_ovr = new Image();
  var menu_member_off = new Image();
  var menu_dir_ovr    = new Image();
  var menu_dir_off    = new Image();
  var menu_honor_ovr  = new Image();
  var menu_honor_off  = new Image();
  var menu_jsae_ovr   = new Image();
  var menu_jsae_off   = new Image();
}
//画像の割り当てプリロード
function preLoad(){
  menu_top_ovr.src    = "../img/b_top_o.gif";
  menu_top_off.src    = "../img/b_top.gif";
  menu_org_ovr.src    = "../img/b_org_o.gif";
  menu_org_off.src    = "../img/b_org.gif";
  menu_event_ovr.src  = "../img/b_event_o.gif";
  menu_event_off.src  = "../img/b_event.gif";
  menu_labo_ovr.src   = "../img/b_labo_o.gif";
  menu_labo_off.src   = "../img/b_labo.gif";
  menu_formula_ovr.src   = "../img/b_formula_o.gif";
  menu_formula_off.src   = "../img/b_formula.gif";
  menu_pub_ovr.src    = "../img/b_pub_o.gif";
  menu_pub_off.src    = "../img/b_pub.gif";
  menu_join_ovr.src   = "../img/b_join_o.gif";
  menu_join_off.src   = "../img/b_join.gif";
  menu_access_ovr.src = "../img/b_access_o.gif";
  menu_access_off.src = "../img/b_access.gif";
  menu_member_ovr.src = "../img/b_member_o.gif";
  menu_member_off.src = "../img/b_member.gif";
  menu_dir_ovr.src    = "../img/b_dir_o.gif";
  menu_dir_off.src    = "../img/b_dir.gif";
  menu_honor_ovr.src  = "../img/b_honor_o.gif";
  menu_honor_off.src  = "../img/b_honor.gif";
  menu_jsae_ovr.src   = "../img/b_jsae_o.gif";
  menu_jsae_off.src   = "../img/b_jsae.gif";
}
//画像の割り当てプリロード（トップページ用）
function preLoadTop(){
  menu_top_ovr.src    = "./img/b0_top_o.gif";
  menu_top_off.src    = "./img/b0_top.gif";
  menu_org_ovr.src    = "./img/b0_org_o.gif";
  menu_org_off.src    = "./img/b0_org.gif";
  menu_event_ovr.src  = "./img/b0_event_o.gif";
  menu_event_off.src  = "./img/b0_event.gif";
  menu_labo_ovr.src   = "./img/b0_labo_o.gif";
  menu_labo_off.src   = "./img/b0_labo.gif";
  menu_formula_ovr.src   = "./img/b0_formula_o.gif";
  menu_formula_off.src   = "./img/b0_formula.gif";
  menu_pub_ovr.src    = "./img/b0_pub_o.gif";
  menu_pub_off.src    = "./img/b0_pub.gif";
  menu_join_ovr.src   = "./img/b0_join_o.gif";
  menu_join_off.src   = "./img/b0_join.gif";
  menu_access_ovr.src = "./img/b0_access_o.gif";
  menu_access_off.src = "./img/b0_access.gif";
  menu_member_ovr.src = "./img/b0_member_o.gif";
  menu_member_off.src = "./img/b0_member.gif";
  menu_dir_ovr.src    = "./img/b0_dir_o.gif";
  menu_dir_off.src    = "./img/b0_dir.gif";
  menu_honor_ovr.src  = "./img/b0_honor_o.gif";
  menu_honor_off.src  = "./img/b0_honor.gif";
  menu_jsae_ovr.src   = "./img/b0_jsae_o.gif";
  menu_jsae_off.src   = "./img/b0_jsae.gif";
}
// カーソルがのったときの処理
function rollon(img){
  imgon=eval(img+"_ovr.src");
  if ((document.images)&&(imgon)){
    document.images[img].src=eval(img+"_ovr.src");
  }
}
// カーソルが外れたときの処理
function rolloff(img){
  imgoff=eval(img+"_off.src");
  if((document.images)&&(imgoff)){
    document.images[img].src=eval(img+"_off.src");
  }
}

// ミニウィンドウを開く
function popopen( htmlname ){
  win = window.open( htmlname, "open",
          "width=620,height=580,status=no,resizable=yes,toolbar=no,scrollbars=yes" );
  win.focus();
}