function css_browser_selector(u)
{
    var ua = u.toLowerCase()
    var h= document.getElementById("container");
	if((ua.indexOf("ipad")!=-1) || (ua.indexOf("iphone")!= -1)){
	   h.className = "ios";
	}
	else if((ua.indexOf("safari")!=-1) || (ua.indexOf("mozilla")!=-1 && ua.indexOf("mac")!=-1))
	{
	    h.className="mac";
	}
}