function css_browser_selector(){
	var browser = navigator.userAgent.toLowerCase();
	var platform = navigator.platform.toLowerCase();
	var htmlClass = '';
	if (platform.indexOf('iphone') > -1 || platform.indexOf('ipad') > -1){
		htmlClass = 'iOS-';
	}
	else if (platform.indexOf('mac') > -1){
		htmlClass = 'mac-';
	}
	if (browser.indexOf('safari') > -1){
		htmlClass = htmlClass+'safari';
	}
	else if (browser.indexOf('opera') > -1){
		htmlClass = htmlClass+'opera';
	}
	else if (browser.indexOf('firefox') > -1){
		htmlClass = htmlClass+'firefox';
	}
	else if (browser.indexOf('gecko') > -1){
		htmlClass = htmlClass+'mozilla';
	}
	var page = document.getElementsByTagName('html')[0];
	if (htmlClass != '') page.className = htmlClass;
}

css_browser_selector();