var uAnt = navigator.userAgent;
var os = "win"; //下記判定時以外のOS
var brw = "ie"; //下記判定時以外のブラウザ
 
if (uAnt.indexOf("Win") != -1) os = "win";
if (uAnt.indexOf("Mac") != -1) os = "mac";
 
if (uAnt.indexOf("Opera") > -1){
 brw = "ie";
}else if (uAnt.indexOf("MSIE") > -1){
 brw = "ie";
}else if (uAnt.indexOf("Safari") > -1){
 brw = "saf";
}else if (uAnt.indexOf("Firefox") > -1){
 brw = "ff";
}else if (document.layers){
 brw = "nn4";
}else if (uAnt.indexOf("Netscape6") > -1){
 brw = "nn6";
}else if (uAnt.indexOf("Netscape/7") > -1){
 brw = "nn7";
}
 
document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="../ibc/css/'+os+'_'+brw+'_utf.css">')
//document.write(os);