if(navigator.appName=="Microsoft Internet Explorer"){
        if(navigator.userAgent.indexOf('Win') != -1){
        document.write('<link rel="stylesheet" type="text/css" href="../css/win_ie.css">');
        }else{
        document.write('<LINK rel="stylesheet" type="text/css" href="../css/mac_ie.css">');
        }
}
else if(navigator.appName=="Netscape"){
        if(navigator.userAgent.indexOf('Win') != -1){
        document.write('<link rel="stylesheet" type="text/css" href="../css/win_nn.css">');
        }else{
        document.write('<LINK rel="stylesheet" type="text/css" href="../css/mac_nn.css">');
        }
}
function openWin(URL,Wname,Wwidth,Wheight){
        window.open(URL,Wname,"width="+Wwidth+",height="+Wheight+",scrollbars=yes,resizable=yes,toolbar=no,location=no,directories=no,status=no").focus();
}
function mdown(e) {
  if (navigator.appName == "Microsoft Internet Explorer") {
    if (event.button == 2) {
      alert("右クリックは使用できません");
      return(false);
    }
  } else if (navigator.appName == "Netscape") {
    if (e.which == 3) {
      alert("右クリックは使用できません");
      return(false);
    }
  }
}
if (document.all) {
  document.onmousedown = mdown;
}
if (document.layers) {
  window.onmousedown = mdown;
  window.captureEvents(Event.MOUSEDOWN);
}