// HpbImgPreload:
function HpbImgPreload()
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=(document.layers && (appVer >= 4));
  var isIE=(document.all    && (appVer >= 4));
  if (isNC || 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];
      }
    }
  }
}

// HpbImgFind:
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;
}

// HpbImgSwap:
function HpbImgSwap(imgName, imgSrc)
{
  var appVer=parseInt(navigator.appVersion);
  var isNC=(document.layers && (appVer >= 4));
  var isIE=(document.all    && (appVer >= 4));
  if (isNC || 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;

//HPB_SCRIPT_PLD_50
HpbImgPreload('_HPB_ROLLOVER1', '../images/bitokenkou_img/utsubuse1.jpg', '../images/bitokenkou_img/utsubuse2.jpg');
HpbImgPreload('_HPB_ROLLOVER3', '../images/bitokenkou_img/hukkin1.JPG', '../images/bitokenkou_img/hukkin2.gif');
HpbImgPreload('_HPB_ROLLOVER4', '../images/bitokenkou_img/hineri1.JPG', '../images/bitokenkou_img/hineri2.gif');
HpbImgPreload('_HPB_ROLLOVER2', '../images/bitokenkou_img/ashikumi1.jpg', '../images/bitokenkou_img/asihkumi2.jpg');
HpbImgPreload('_HPB_ROLLOVER5', '../images/bitokenkou_img/ktausiro1.jpg', '../images/bitokenkou_img/ktausiro2.jpg');
HpbImgPreload('_HPB_ROLLOVER6', '../images/bitokenkou_img/ktaseiza1.jpg', '../images/bitokenkou_img/ktaseiza2.jpg');

HpbImgPreload('_HPB_ROLLOVER3', '../images/bitokenkou_img/koshi/aomuke1.jpg', '../images/bitokenkou_img/koshi/aomuke2.jpg');
HpbImgPreload('_HPB_ROLLOVER2', '../images/bitokenkou_img/koshi/katahaba1.jpg', '../images/bitokenkou_img/koshi/katahaba2.jpg');


//正しい数字が入力されているかを判定
function illegalString(){
  T = parseInt(document.f.t.value);
  U = parseInt(document.f.u.value);

  if((T >= -273) && (U <= 100) && (U >= 0)){
    di_index();
  }else{
    alert("入力された数値が不正です。");
  }
}

function di_index(){
  di = 0.81*T + 0.01*U*(0.99*T - 14.3) + 46.3;

  if(di < 75) mess = "快適です。";
  else if(di < 80) mess = "「やや暑い」";
  else if(di < 85) mess = "「暑くて汗が出る」";
  else if(di < 130)mess = "「暑くてたまらない」";
  else mess = "そんなに暑くて、死んでいないのですか？";

  //有効桁数の調整
  di = Math.round(di);

  alert("不快指数は、" + di + "です。\n" + mess);
}