// browser detect for stylesheet
function checkOS(){

	// file name for PC IE style sheet: change below	
	winsh = '<link href="includes/style.css" rel="stylesheet" type="text/css">';
	// file name for mac IE style sheet: change below
	macsh_ie = '<link href="includes/styles_IEMac.css" rel="stylesheet" type="text/css">';

	if (!document.layers) {
		if (navigator.platform == "Win32") document.write(winsh);
		else document.write(macsh_ie);
	}
}
checkOS();