// ブラウザによってスタイルシートを振り分ける
// プラットフォーム(Win32/MacPPC)
var os = navigator.platform;
// ブラウザ名(Microsoft Internet Explorer/Netscape)
var brName = navigator.appName.charAt(0);
// ブラウザバージョン
var brVer = navigator.appVersion.charAt(0);
//
if(os == "Win32"){
// Newscape4:
  if((brName == "N") && (brVer >= 4)){
    cssLink = '<LINK REL="stylesheet" TYPE="text/css" HREF="../css/style_nn4.css">';
    if(brVer >= 5){
      cssLink = '<LINK REL="stylesheet" TYPE="text/css" HREF="../css/style_regular.css">';
    }
  } else if((brName == "M") && (brVer >= 4)){
    cssLink = '<LINK REL="stylesheet" TYPE="text/css" HREF="../css/style_regular.css">';
  }
} else if(os == "MacPPC"){
  if((brName == "N") && (brVer >= 4)){
    cssLink = '<LINK REL="stylesheet" TYPE="text/css" HREF="../css/style_nn4_m.css">';
    if(brVer >= 5){
      cssLink = '<LINK REL="stylesheet" TYPE="text/css" HREF="../css/style_regular.css">';
    }
  }	else if((brName == "M") && (brVer >= 4)){
    cssLink = '<LINK REL="stylesheet" TYPE="text/css" HREF="../css/style_regular.css">';
  }
}
document.write(cssLink);