<!-- ロールオーバー -->
function HpbImgPreload()
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=false,isN6=false,isIE=false;
  if (document.all && appVer >= 4) isIE=true; else
    if (document.getElementById && appVer > 4) isN6=true; else
      if (document.layers && appVer >= 4) isNC=true;
  if (isNC||isN6||isIE)
  {
    if (document.images)
    {
      var imgName = HpbImgPreload.arguments[0];
      var cnt;
      swImg[imgName] = new Array;
      for (cnt = 1; cnt < HpbImgPreload.arguments.length; cnt++)
      {
        swImg[imgName][HpbImgPreload.arguments[cnt]] = new Image();
        swImg[imgName][HpbImgPreload.arguments[cnt]].src = HpbImgPreload.arguments[cnt];
      }
    }
  }
}


function HpbImgFind(doc, imgName)
{
  for (var i=0; i < doc.layers.length; i++)
  {
    var img = doc.layers[i].document.images[imgName];
    if (!img) img = HpbImgFind(doc.layers[i], imgName);
    if (img) return img;
  }
  return null;
}


function HpbImgSwap(imgName, imgSrc)
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=false,isN6=false,isIE=false;
  if (document.all && appVer >= 4) isIE=true; else
    if (document.getElementById && appVer > 4) isN6=true; else
      if (document.layers && appVer >= 4) isNC=true;
  if (isNC||isN6||isIE)
  {
    if (document.images)
    {
      var img = document.images[imgName];
      if (!img) img = HpbImgFind(document, imgName);
      if (img) img.src = imgSrc;
    }
  }
}

var swImg; swImg=new Array;
<!-- トップ上　メニューボタン -->
HpbImgPreload('_HPB_ROLLOVER1', 'img/common/top_mb_rinen_1.gif', 'img/common/top_mb_rinen_2.gif');
HpbImgPreload('_HPB_ROLLOVER2', 'img/common/top_mb_div_1.gif', 'img/common/top_mb_div_2.gif');
HpbImgPreload('_HPB_ROLLOVER3', 'img/common/top_mb_iin_1.gif', 'img/common/top_mb_iin_2.gif');
HpbImgPreload('_HPB_ROLLOVER4', 'img/common/top_mb_kyouiku_1.gif', 'img/common/top_mb_kyouiku_2.gif');
<!-- トップ右　採用情報ボタン -->
HpbImgPreload('_HPB_ROLLOVER5', 'img/common/b_saiyou_1.gif', 'img/common/b_saiyou_2.gif');
HpbImgPreload('_HPB_ROLLOVER6', 'img/common/b_voice_1.gif', 'img/common/b_voice_2.gif');
HpbImgPreload('_HPB_ROLLOVER16', 'img/common/b_takuji_1.gif', 'img/common/b_takuji_2.gif');
<!-- トップ上　宮田TOPボタン -->
HpbImgPreload('_HPB_ROLLOVER7', 'img/common/b_miyata-home_1.gif', 'img/common/b_miyata-home_2.gif');
<!-- トップ左　部署ボタン -->
HpbImgPreload('_HPB_ROLLOVER8', 'img/common/b_busho_01_gairai_1.gif', 'img/common/b_busho_01_gairai_2.gif');
HpbImgPreload('_HPB_ROLLOVER9', 'img/common/b_busho_02_byoutou_1.gif', 'img/common/b_busho_02_byoutou_2.gif');
HpbImgPreload('_HPB_ROLLOVER10', 'img/common/b_busho_03_naikakei-ippan_1.gif', 'img/common/b_busho_03_naikakei-ippan_2.gif');
HpbImgPreload('_HPB_ROLLOVER11', 'img/common/b_busho_04_tokushushikkann_1.gif', 'img/common/b_busho_04_tokushushikkann_2.gif');
HpbImgPreload('_HPB_ROLLOVER12', 'img/common/b_busho_05_ryouyou-iryou-kaigo_1.gif', 'img/common/b_busho_05_ryouyou-iryou-kaigo_2.gif');
HpbImgPreload('_HPB_ROLLOVER13', 'img/common/b_busho_06_ryouyou-kaigo_1.gif', 'img/common/b_busho_06_ryouyou-kaigo_2.gif');
<!-- トップ右　バナー -->
HpbImgPreload('_HPB_ROLLOVER14', 'img/common/banner_miyata-top_1.gif', 'img/common/banner_miyata-top_2.gif');
HpbImgPreload('_HPB_ROLLOVER15', 'img/common/banner_lta-top_1.gif', 'img/common/banner_lta-top_2.gif');
<!-- 左メニューボタン -->
HpbImgPreload('_HPB_ROLLOVER21', 'img/common/left_mb_rinen_1.gif', 'img/common/left_mb_rinen_2.gif');
HpbImgPreload('_HPB_ROLLOVER22', 'img/common/left_mb_div_1.gif', 'img/common/left_mb_div_2.gif');
HpbImgPreload('_HPB_ROLLOVER23', 'img/common/left_mb_iin_1.gif', 'img/common/left_mb_iin_2.gif');
HpbImgPreload('_HPB_ROLLOVER24', 'img/common/left_mb_kyouiku_1.gif', 'img/common/left_mb_kyouiku_2.gif');
HpbImgPreload('_HPB_ROLLOVER25', 'img/common/left_mb_saiyou_1.gif', 'img/common/left_mb_saiyou_2.gif');
HpbImgPreload('_HPB_ROLLOVER26', 'img/common/left_mb_top_1.gif', 'img/common/left_mb_top_2.gif');
HpbImgPreload('_HPB_ROLLOVER27', 'img/common/left_mb_miyata_top_1.gif', 'img/common/left_mb_miyata_top_2.gif');
<!-- ページトップボタン -->
HpbImgPreload('_HPB_ROLLOVER28', 'img/common/b_pagetop_1.gif', 'img/common/b_pagetop_2.gif');