added Array.prototype.indexOf

core.js

@@ -19,6 +19,56 @@
     }
 
 
+    /***********************************************************************
+        Global Javascript objects
+    ************************************************************************/
+
+    /* Workarounds for browsers which do not natively support some ECMA
+     * standards.
+     *
+     * Although extending the DOM is a very bad idea and considered "evil",
+     * adding missing methods to global javascript objects is perfectly 
+     * acceptable.
+     */
+
+    /* This is taken from https://developer.mozilla.org and is exactly the
+     * one specified in ECMA-262.
+     */
+
+    if (!Array.prototype.indexOf) {  
+        Array.prototype.indexOf = function (searchElement /*, fromIndex */ ) {
+            "use strict";
+            if (this == null) {
+                throw new TypeError();
+            }
+            var t = Object(this);
+            var len = t.length >>> 0;
+            if (len === 0) {
+                return -1;
+            }
+            var n = 0;
+            if (arguments.length > 0) {
+                n = Number(arguments[1]);
+                if (n != n) { // shortcut for verifying if it's NaN
+                    n = 0;
+                } else if (n != 0 && n != Infinity && n != -Infinity) {
+                    n = (n > 0 || -1) * Math.floor(Math.abs(n));
+                }
+            }
+            if (n >= len) {
+                return -1;
+            }
+            var k = n >= 0 ? n : Math.max(len - Math.abs(n), 0);
+            for (; k < len; k++) {
+                if (k in t && t[k] === searchElement) {
+                    return k;
+                }
+            }
+            return -1;
+        }
+    }
+
+
     /***********************************************************************
         Str
     ************************************************************************/