var agent = navigator.userAgent.toLowerCase();
var is_mac = (agent.indexOf("mac") != -1);


window.onload = function(){	
	if(is_mac){
		
document.getElementById('defaultcss').setAttribute("href","http://www.ucf.edu/styles/stylemac.css");
	}
	else{
		
document.getElementById('defaultcss').setAttribute("href","http://www.ucf.edu/styles/stylepc.css");
	}
}