var tag_pre = '<style type="text/css">';
var tag_suf = '</style>';
var ua =  navigator.userAgent.toLowerCase();

if (ua.indexOf('win') != -1 && ua.indexOf('msie') != -1) {
	document.write(tag_pre + 'html body{font-size:62.5%;}' + tag_suf);
}

if(ua.indexOf('mac') != -1 && ua.indexOf('safari') != -1) {
	document.write(tag_pre + 'html body{font-family:"Hiragino Kaku Gothic Pro W3"}' + tag_suf);
}