if (navigator.appVersion.indexOf("Safari") > -1) 
document.write("<link rel='stylesheet' href='../css/navi_safari.css' type='text/css'>");
else if (!document.all && document.getElementById)
document.write("<link rel='stylesheet' href='../css/navi_nn7.css' type='text/css'>");
else 
document.write("<link rel='stylesheet' href='../css/navi.css' type='text/css'>");
// JavaScript Document