//　ブラウザ名取得
//　Netscape Navigator ->  Netscape
//　Internet Explorer  ->　Explorer
function getBrowserName() {
  var aName  = navigator.appName.toUpperCase();
  var uName  = navigator.userAgent.toUpperCase();
  if (aName.indexOf("NETSCAPE") >= 0)       return "Netscape";
  if (uName.indexOf("OPERA") >= 0)       return "Netscape";
  if (aName.indexOf("MICROSOFT") >= 0)      return "Explorer";
  return "";
  }
//　ブラウザバージョン取得
function getBrowserVer() {
  var browser = getBrowserName();
  var version = 0;
  var s = 0;
  var e = 0;
  var appVer  = navigator.appVersion;
  if (browser == "Explorer") {
    appVer  = navigator.userAgent;
    s = appVer.indexOf("MSIE ",0) + 5;
    e = appVer.indexOf(";",s);
    version = eval(appVer.substring(s,e));
    }
  else {
    s = appVer.indexOf(" ",0);
    version = eval(appVer.substring(0,s));
    if (version >= 5) version++;
    }
  return version;
  }
//　OS名取得
//　Macintosh              　->  MacOS
//　Windows95/98/NT/2000/XP  ->　Windows
function getOS() {
  var uAgent  = navigator.userAgent.toUpperCase();
  if (uAgent.indexOf("MAC") >= 0)           return "MacOS";
  if (uAgent.indexOf("WIN") >= 0)           return "Windows";
  return "";
  }


if(getBrowserVer() >= 3){
  var imgN = new Array();
  imgN[0] = new Image();  imgN[0].src = "sozai/top_icon_1.jpg";
  imgN[1] = new Image();  imgN[1].src = "sozai/top_icon_1_c.jpg";
  imgN[2] = new Image();  imgN[2].src = "sozai/top_icon_2.jpg";
  imgN[3] = new Image();  imgN[3].src = "sozai/top_icon_2_c.jpg";
  imgN[4] = new Image();  imgN[4].src = "sozai/top_icon_3.jpg";
  imgN[5] = new Image();  imgN[5].src = "sozai/top_icon_3_c.jpg";
  imgN[6] = new Image();  imgN[6].src = "sozai/top_icon_4.jpg";
  imgN[7] = new Image();  imgN[7].src = "sozai/top_icon_4_c.jpg";
  imgN[8] = new Image();  imgN[8].src = "sozai/top_icon_5.jpg";
  imgN[9] = new Image();  imgN[9].src = "sozai/top_icon_5_c.jpg";
  imgN[10] = new Image();  imgN[10].src = "sozai/top_icon_6.jpg";
  imgN[11] = new Image();  imgN[11].src = "sozai/top_icon_6_c.jpg";
  imgN[12] = new Image();  imgN[12].src = "sozai/top_icon_7.jpg";
  imgN[13] = new Image();  imgN[13].src = "sozai/top_icon_7_c.jpg";
  imgN[14] = new Image();  imgN[14].src = "sozai/top_icon_8.jpg";
  imgN[15] = new Image();  imgN[15].src = "sozai/top_icon_8_c.jpg";
 }
function Nin(nam,num){
  if(getBrowserVer() >= 3) document.images[nam].src = imgN[num].src;
  }
function Nout(nam,num){
  if(getBrowserVer() >= 3) document.images[nam].src = imgN[num].src;
  }