function BrowserCheck() { 
  var b = navigator.appName ;
  if (b=="Netscape") 
  	this.b = "ns" ;
  else 
  	if (b=="Microsoft Internet Explorer") 
  		this.b = "ie" ;
  	else 
  		this.b = b ;
  this.v = parseInt(navigator.appVersion) ;
  this.ns = (this.b=="ns" && this.v>=4) ;
  this.ns4 = (this.b=="ns" && this.v==4) ;
  this.ns5 = (this.b=="ns" && this.v==5) ;
  this.ie = (this.b=="ie" && this.v>=4) ;
  this.ie4 = (navigator.userAgent.indexOf('MSIE 4')>0) ;
  this.ie5 = (navigator.userAgent.indexOf('MSIE 5')>0) ;
  if (this.ie5) 
  	this.v = 5 ;
  this.min = (this.ns||this.ie) ;
 } 

 var is = new BrowserCheck(); 

 if(is.ie || is.ns5) 
  document.write("<link rel='stylesheet' type='text/css' href='/style/iestyle.css'>"); 
 else if(is.ns) 
  document.write("<link rel='stylesheet' type='text/css' href='/style/nnstyle.css'>");