Does a JavaScript array contain a search element

ArrayContains.js

// Array.contains
// compares searchElement to elements of the Array using strict equality
// (the same method used by the ===, or triple-equals, operator) and returns true or false
// Requires Array.indexOf. If not, see:
// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Array/indexOf
// ex: [1,2,3].contains(2) returns true

if (!Array.prototype.contains) {
	Array.prototype.contains = function (searchElement) {
		return this.indexOf(searchElement) !== -1;
	};
}