var ua = navigator.userAgent.toLowerCase();

var isSafari = (ua.indexOf("safari")+1);

function init(){	
	if(isSafari){		
		document.write("<link rel='stylesheet' type='text/css' href='/css/left-nav-safari.css' />");
	}
	else{
		document.write("<link rel='stylesheet' type='text/css' href='/css/left-nav.css' />");
	}
}

init();