// Function.bind polyfill
if (!Function.prototype.bind) {
  Function.prototype.bind = function(oThis) {
    if (typeof this !== 'function') {
      // closest thing possible to the ECMAScript 5
      // internal IsCallable function
      throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
    }

    var aArgs   = Array.prototype.slice.call(arguments, 1),
        fToBind = this,
        fNOP    = function() {},
        fBound  = function() {
          return fToBind.apply(this instanceof fNOP && oThis
                 ? this
                 : oThis,
                 aArgs.concat(Array.prototype.slice.call(arguments)));
        };

    fNOP.prototype = this.prototype;
    fBound.prototype = new fNOP();

    return fBound;
  };
}

// rAF polyfill
(function() {
    var lastTime = 0;
    var vendors = ['ms', 'moz', 'webkit', 'o'];
    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
        window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
        window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] 
                                   || window[vendors[x]+'CancelRequestAnimationFrame'];
    }
 
    if (!window.requestAnimationFrame)
        window.requestAnimationFrame = function(callback, element) {
            var currTime = new Date().getTime();
            var timeToCall = Math.max(0, 16 - (currTime - lastTime));
            var id = window.setTimeout(function() { callback(currTime + timeToCall); }, 
              timeToCall);
            lastTime = currTime + timeToCall;
            return id;
        };
 
    if (!window.cancelAnimationFrame)
        window.cancelAnimationFrame = function(id) {
            clearTimeout(id);
        };
}());

// Identify browser based on useragent string
(function( ua ) {
  ua = ua.toLowerCase();
  var match = /(chrome)[ \/]([\w.]+)/.exec( ua ) ||
    /(webkit)[ \/]([\w.]+)/.exec( ua ) ||
    /(opera)(?:.*version|)[ \/]([\w.]+)/.exec( ua ) ||
    /(msie) ([\w.]+)/.exec( ua ) ||
    ua.indexOf("compatible") < 0 && /(mozilla)(?:.*? rv:([\w.]+)|)/.exec( ua ) ||
    [];
  var matched = {
    browser: match[ 1 ] || "",
    version: match[ 2 ] || "0"
  };
  browser = {};
  if ( matched.browser ) {
      browser[ matched.browser ] = true;
      browser.version = matched.version;
  }
  // Chrome is Webkit, but Webkit is also Safari.
  if ( browser.chrome ) {
    browser.webkit = true;
  } else if ( browser.webkit ) {
    browser.safari = true;
  }
  if (window.$) $.browser = browser;
  return browser;
})( navigator.userAgent );

// Naive useragent detection pattern
var is_iphone = (navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))
var is_ipad = (navigator.userAgent.match(/iPad/i))
var is_android = (navigator.userAgent.match(/Android/i))
var is_mobile = is_iphone || is_ipad || is_android
var is_desktop = ! is_mobile;
var app_devicePixelRatio = is_mobile ? devicePixelRatio : 1;

function selectElementContents(el) {
  if (window.getSelection && document.createRange) {
    var sel = window.getSelection();
    var range = document.createRange();
    range.selectNodeContents(el);
    sel.removeAllRanges();
    sel.addRange(range);
  } else if (document.selection && document.body.createTextRange) {
    var textRange = document.body.createTextRange();
    textRange.moveToElementText(el);
    textRange.select();
  }
}