var Agent = navigator.userAgent;
if(Agent.indexOf('Mac') != -1) {
	if(navigator.userAgent.indexOf("Firefox") > -1){
		document.write("<link rel=\"stylesheet\" href=\"http://www.sanbelm.com/css/design-ff.css\" type=\"text/css\" />");
	}else{
		document.write("<link rel=\"stylesheet\" href=\"http://www.sanbelm.com/css/design.css\" type=\"text/css\" />");
		
	}
}else{
	document.write("<link rel=\"stylesheet\" href=\"http://www.sanbelm.com/css/design.css\" type=\"text/css\" />");
}