Possible solution to IE8 problem

Function to convert querySelector object to array.

src/echo.js

@@ -10,8 +10,9 @@ window.Echo = (function (window, document, undefined) {
   };
 
   var _pollImages = function () {
-    for (var i = 0, len = store.length; i < len; i++) {
+    var imgs = store.slice();
-      var self = store[i];
+    for (var i = 0, len = imgs.length; i < len; i++) {
+      var self = imgs[i];
       if (_inView(self)) {
         self.src = self.getAttribute('data-echo');
         store.splice(i, 1);
@@ -19,9 +20,17 @@ window.Echo = (function (window, document, undefined) {
     }
   };
   
+  var toArray (obj) {
+    var arr = [];
+    for (var i = 0, len = obj.length; i < len; i++) {
+      arr.push(obj[i]);
+    }
+    return arr;
+  }
+  
   var init = function () {
     store = document.querySelectorAll('[data-echo]');
-    store = [].slice.call(store);
+    store = toArray(store);
     _pollImages();
     window.onscroll = _pollImages;
   };