var agent = navigator.userAgent.toLowerCase();
var hw;
var sw;

if (agent.indexOf("mac") != -1) { hw  = "mac"; } else { hw = "pc"; }
if (agent.indexOf("msie") != -1) { sw = "msie"; } else { sw = "mozilla"; }
		
document.write("<link rel='stylesheet' type='text/css' href='include/css/" + hw + "_" + sw + ".css'>");