make tag-it work under IE

js/ie-compat.js

@@ -0,0 +1,45 @@
+if (!Array.prototype.filter)
+{
+  Array.prototype.filter = function(fun /*, thisp*/)
+  {
+    var len = this.length;
+    if (typeof fun != "function")
+      throw new TypeError();
+
+    var res = new Array();
+    var thisp = arguments[1];
+    for (var i = 0; i < len; i++)
+    {
+      if (i in this)
+      {
+        var val = this[i]; // in case fun mutates this
+        if (fun.call(thisp, val, i, this))
+          res.push(val);
+      }
+    }
+
+    return res;
+  };
+};
+if (!Array.prototype.indexOf)
+{
+  Array.prototype.indexOf = function(elt /*, from*/)
+  {
+    var len = this.length;
+
+    var from = Number(arguments[1]) || 0;
+    from = (from < 0)
+         ? Math.ceil(from)
+         : Math.floor(from);
+    if (from < 0)
+      from += len;
+
+    for (; from < len; from++)
+    {
+      if (from in this &&
+          this[from] === elt)
+        return from;
+    }
+    return -1;
+  };
+};

js/tag-it.js

@@ -4,11 +4,11 @@
 
 		var el = this;
 
-		const BACKSPACE		= 8;
-		const ENTER			= 13;
-		const SPACE			= 32;
-		const COMMA			= 44;
-		const TAB			= 9;
+		var BACKSPACE		= 8;
+		var ENTER			= 13;
+		var SPACE			= 32;
+		var COMMA			= 44;
+		var TAB			    = 9;
 
 		// option defaults
 		if (!options.itemName) options.itemName = 'item';