var ua  = navigator.userAgent.toLowerCase();
var link_css="";

isope=ua.indexOf('opera')!=-1;
ismie=ua.indexOf('msie')!=-1 && ua.indexOf('mac')!=-1;
iswie=ua.indexOf('msie')!=-1 && ua.indexOf('win')!=-1;
isomz=ua.indexOf('gecko')!=-1 ;
ismac=ua.indexOf('mac')!=-1;
iswin=ua.indexOf('win')!=-1;

if(isope) {link_css="<link href=../css/'brows_ope.css' rel='stylesheet' type='text/css' media='all'>";}
if(ismie){link_css='<link rel="stylesheet" type="text/css" href="../css/brows_mie.css" media="all">';}
if(iswie){link_css='<link rel="stylesheet" type="text/css" href="../css/brows_wie.css" media="all">';}
if(isomz) {link_css="<link href='../css/brows_nn.css' rel='stylesheet' type='text/css' media='all'>";}

document.write(link_css);