jQuery: Add class to every other matching element

Using jQuery, how can I add a class to every other matching element?

In the example below, I want the class "even" to be added to every second <li>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
<script type="text/javascript">

$(document).ready(function() {


<style type="text/css">
.even {
color: red;
background: yellow;


  <li>Item 1</i>
  <li>Item 2 should be red</i>
  <li>Item 3</i>
  <li>Item 4 should be red</i>
  <li>Item 5</i>
  <li>Item 6 should be red</i>
  <li>Item 7</i>
  <li>Item 8 should be red</i>



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Check this page : http://jsfiddle.net/KrXMQ/1/

$(document).ready(function() {
    $("div ul li:odd").addClass("even");

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first one index is zero (even)...

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