isSafari = (navigator.appVersion.indexOf("Safari") != -1);
isFirefox = (navigator.userAgent.indexOf("Firefox") != -1);
isChrome = navigator.userAgent.toLowerCase().indexOf('chrome') > -1;

if (!isChrome && isSafari) {
	document.write('<link rel="stylesheet" type="text/css" href="' + strRoot + '/css/safari.css">');
}
if (isFirefox) {
	document.write('<link rel="stylesheet" type="text/css" href="' + strRoot + '/css/firefox.css">');
}