var ua = navigator.userAgent;
var bs = 'sps_ffox.css';
  
if(ua.indexOf("MSIE") >= 0) 
{
  bs = 'sps_msie.css';
}
else 
{
  bs = 'sps_ffox.css';
}
  
document.write('<link rel="stylesheet" type="text/css" href="'+bs+'">');