function sniffer(){
	var agent = navigator.userAgent.toLowerCase()
	var isIE = agent.indexOf("msie")!=-1
	var isNS = navigator.appName.indexOf("Netscape")!=1
	var isMac = agent.indexOf("mac")>0
	var isWin = agent.indexOf("win")>0

	if(isIE && isWin) {document.write('<link rel=\"stylesheet\" type=\"text/css\" href=\"http://www.nps.gov/pore/resources/style.css\" />');return;}
	if(isIE && isMac) {document.write('<link rel=\"stylesheet\" type=\"text/css\" href=\"http://www.nps.gov/pore/resources/style.css\" />');return;}
	if(isNS && isWin) {document.write('<link rel=\"stylesheet\" type=\"text/css\" href=\"http://www.nps.gov/pore/resources/win_ns.css\" />');return;}
	if(isNS && isMac) {document.write('<link rel=\"stylesheet\" type=\"text/css\" href=\"http://www.nps.gov/pore/resources/style.css\" />');return;}
	if(!isWin && !isMac) document.write('<link rel=\"stylesheet\" type=\"text/css\" href=\"http://www.nps.gov/pore/resources/style.css\" />');
}
sniffer();