var ag = navigator.userAgent.toLowerCase();
var url = null;
if(         ag.indexOf('win') != -1 ){
    if(        ag.indexOf('msie'   ) != -1 ){       url="css_wm.css";
    } else if( ag.indexOf('mozilla') != -1 ){
		if(        ag.indexOf('mozilla/4') != -1 ){ url="css_wn4.css";
	    } else if( ag.indexOf('mozilla/5') != -1 ){ url="css_wn6.css";
	    } else                                    { url="css_wn.css"; }
    } else {                                        url="css_o.css" ; }
} else if ( ag.indexOf('mac') != -1 ){
    if(        ag.indexOf('msie'   ) != -1 ){       url="css_mm.css";
    } else if( ag.indexOf('mozilla') != -1 ){
		if(        ag.indexOf('mozilla/4') != -1 ){ url="css_mn4.css";
	    } else if( ag.indexOf('mozilla/5') != -1 ){ url="css_mn6.css";
	    } else                                    { url="css_mn.css"; }
    } else {                                        url="css_o.css" ; }
} else {                                            url="css_o.css" ; }

document.write("<LINK rel='stylesheet' href='../js/"+url+"' type='text/css'>");
//document.write("<LINK rel='stylesheet' href='../js/"+url+"' type='text/css'>");
//document.write("<BR>スタイルシート../js/"+url);