var ua = navigator.userAgent.toLowerCase(); 

// browser name
this.isGecko     = (ua.indexOf('gecko') != -1);
this.isMozilla   = (this.isGecko && ua.indexOf("gecko/") + 14 == ua.length);
this.isNS        = ( (this.isGecko) ? (ua.indexOf('netscape') != -1) : ( (ua.indexOf('mozilla') != -1) && (ua.indexOf('spoofer') == -1) && (ua.indexOf('compatible') == -1) && (ua.indexOf('opera') == -1) && (ua.indexOf('webtv') == -1) && (ua.indexOf('hotjava') == -1) ) );
this.isIE        = ( (ua.indexOf("msie") != -1) && (ua.indexOf("opera") == -1) && (ua.indexOf("webtv") == -1) ); 

if (this.isGecko || this.isMozilla || this.isNS ) {
  document.write( '<LINK TYPE="text/css" HREF="/gabeautyproducts/stylesheets/netscape.css" REL=STYLESHEET>' );
} else {
  if (this.isIE) {
    document.write( '<LINK TYPE="text/css" HREF="/gabeautyproducts/stylesheets/ie.css" REL=STYLESHEET>' ); 
  }
}