if (navigator.platform.indexOf('Mac') > -1) {
    //mac users
    if(navigator.appName.indexOf('Microsoft') > -1){
      //explorer
      document.write('<link href="http://www.nttif.com/CSS/mac_ie.css" rel="styleSheet" type="text/css">');
      }else{
      //netscape
      document.write('<link href="http://www.nttif.com/CSS/mac_ns.css" rel="styleSheet" type="text/css">');
  }

  } else {
    //windows or unix
    if (navigator.appName.indexOf('Microsoft') > -1) {
      //explorer
      document.write('<link href="http://www.nttif.com/CSS/win_ie.css" rel="styleSheet" type="text/css">');

    } else {
      //netscape
      document.write('<link href="http://www.nttif.com/CSS/win_ns.css" rel="styleSheet" type="text/css">');
    }

  }
  
function MM_openBrWindow(theURL,winName,features) { 
  window.open(theURL,winName,features);
}


function backToTop() {
  var x1 = x2 = x3 = 0;
  var y1 = y2 = y3 = 0;
  if (document.documentElement) {
      x1 = document.documentElement.scrollLeft || 0;
      y1 = document.documentElement.scrollTop || 0;
  }
  if (document.body) {
      x2 = document.body.scrollLeft || 0;
      y2 = document.body.scrollTop || 0;
  }
  x3 = window.scrollX || 0;
  y3 = window.scrollY || 0;
  var x = Math.max(x1, Math.max(x2, x3));
  var y = Math.max(y1, Math.max(y2, y3));
  window.scrollTo(Math.floor(x / 2), Math.floor(y / 2));
  if (x > 0 || y > 0) {
      window.setTimeout("backToTop()", 25);
  }
}