Added util function.

utils.js

@@ -10,3 +10,13 @@ function createArray(length) {
 
     return a;
 }
+
+function arrayContains(array, element) {
+	for (var i = 0; i < array.length; i++) {
+		if (array[i] == element) {
+			return true;
+		}
+	}
+	
+	return false;
+}