var Mac   = navigator.userAgent.indexOf("Mac") != -1 ? true : false 
    var X11   = navigator.userAgent.indexOf("X11") != -1 ? true : false 
  
  if (document.getElementById) {
 
    else if(Mac) cssurl = "../css/import_mac.css" // Mac W3C対応ブラウザ用CSS
    else if(X11) cssurl = "../css/import.css" // X11 W3C対応ブラウザ用CSS
 
  } 
 
  document.write('<link rel="stylesheet" ')
  document.write('      type="text/css"  ')
  document.write('      href="'+cssurl+'"')
  document.write('>')