var isiPhone = navigator.userAgent.indexOf("iPhone", 0);
var isiPod = navigator.userAgent.indexOf("iPod", 0);
var isiPad = navigator.userAgent.indexOf("iPad", 0);
var isIE6orLower = (typeof document.documentElement.style.maxHeight != "undefined") ? false : true;
var isApple = (isiPhone != -1 || isiPod != -1 || isiPad != -1) ? true : false;