init the awkward code

static/html/jspaint/lib/konami.js

@@ -0,0 +1,44 @@
+var Konami = {};
+
+(function() {
+	var afterSequence = function(sequence, action) {
+		var index = 0;
+
+		return function(event) {
+			var matchedKey = event.keyCode === sequence[index];
+			// if it didn't match, reset and try matching against the first key
+			if (!matchedKey) {
+				index = 0;
+				matchedKey = event.keyCode === sequence[index];
+			}
+
+			if (matchedKey) {
+				index += 1;
+
+				// fix for Firefox with "Search for text when you start typing" enabled
+				// https://support.mozilla.org/en-US/kb/search-contents-current-page-text-or-links
+				// prevent the default (opening Quick Search) for B and A,
+				// which are luckily at the end of the Konami Code sequence
+				// (otherwise it could prevent typing A and B in text fields unwantedly)
+				if (event.keyCode === 66 || event.keyCode === 65) {
+					event.preventDefault();
+				}
+
+				if (index === sequence.length) {
+
+					// reset when sequence completed
+					index = 0;
+
+					// fire action
+					action();
+				}
+			}
+
+		};
+	};
+
+	Konami.code = function(action) {
+		return afterSequence([38, 38, 40, 40, 37, 39, 37, 39, 66, 65], action);
+	};
+
+}());