var winie = "../../css/navi.css";//Windows IE4以降
var macie = "../../css/navi.css";//Mac IE4以降
var n4 = "../../css/navi_nn4.css"; //N4で適用
var n6 = "../../css/navi.css"; //N6以降で適用
var other = "../../css/navi.css";//いずれも適用されない場合

var cssfile;//CSSファイル名
if((document.all) && (navigator.userAgent.indexOf("Win") >= 0)){
	cssfile = winie;//Win IE4以降
}else if((document.all) && (navigator.userAgent.indexOf("Mac") >= 0)){
	cssfile = macie;//Mac IE4以降
}else if(document.layers){
	cssfile = n4; //N4
}else if(document.getElementById){
	cssfile = n6; //N6以降
}else{
	cssfile = other;//その他
}

document.write('<link rel=stylesheet HREF="'+ cssfile +'" type="text/css">');