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    <ul> <li><code>&lt;header&gt;</code> isn't an element, but <code>&lt;head&gt;</code> is.</li> <li>the only legal children of <code>&lt;html&gt;</code> are <code>&lt;head&gt;</code> and <code>&lt;body&gt;</code>. The sample code has a <code>&lt;script&gt;</code> element that's a child of <code>&lt;html&gt;</code></li> <li><code>nav_color_swap</code> sets the classname for navid, rather than <code>navid_array[i]</code>, when <code>navid != navid_array[i]</code>. This is likely the source of your problem.</li> <li>When that's fixed, the click handlers for the <code>&lt;a&gt;</code> will set the class name for all elements to "navCSS1", since the <code>&lt;a&gt;</code> don't have ID attributes.</li> </ul> <p>Since at most two element classes will need to change with each click, I recommend keeping track of the current element rather than looping over all elements:</p> <pre><code>&lt;style type="text/css"&gt; .selected { background-image:url('news_selected.png'); } .news, .news li { padding: 0; margin: 0; list-style-type: none; } ... &lt;/style&gt; &lt;script type="text/javascript"&gt; function createNavSelector(curr_nav, selectedClass, unselectedClass) { return function (nav) { curr_nav.className = unselectedClass; curr_nav = nav; curr_nav.className = selectedClass; } }; &lt;/script&gt; &lt;/head&gt; &lt;body&gt; ... &lt;div class="container_news"&gt; &lt;ul class="news"&gt; &lt;li id="nav1" onclick="nav_select(this)"&gt;Blah 1&lt;/li&gt; &lt;li id="nav2" onclick="nav_select(this)"&gt;Blah 2&lt;/li&gt; &lt;li id="nav3" class="selected" onclick="nav_select(this)"&gt;Blah 3&lt;/li&gt; &lt;li id="nav4" onclick="nav_select(this)"&gt;Blah 4&lt;/li&gt; &lt;li id="nav5" onclick="nav_select(this)"&gt;Blah 5&lt;/li&gt; &lt;/ul&gt; &lt;/div&gt; &lt;script type="text/javascript"&gt; var nav_select = createNavSelector(document.getElementById('nav3'), 'selected', ''); </code></pre> <p>Since the <code>#nav*</code> appear to be a list of news items or a list of navigation items, I switched to using elements, since they carry more semantic information than <code>&lt;div&gt;</code>s. At this point, div-vs-ol/ul is largely a matter of personal preference. </p> <p>I also renamed functions and element classes to reflect their purpose, rather than how they fulfill that purpose. That way, you can change their behavior without requiring a change in name.</p> <p>Did you use the <code>&lt;a&gt;</code> to support old versions of IE? I wouldn't worry about anything older than <a href="http://www.google.com/search?q=browser+statistics" rel="nofollow noreferrer">IE 6</a>.</p> <hr> <p>As per No Refund, No Return's comment, here's some links to get you started on debugging JS using <a href="http://getfirebug.com/" rel="nofollow noreferrer">Firebug</a>. Safari also has a good debugger, if that's your browser of choice.</p> <ul> <li><a href="http://www.evotech.net/blog/2007/06/introduction-to-firebug/" rel="nofollow noreferrer">Intro to Firebug</a></li> <li><a href="http://www.webmonkey.com/tutorial/Build_Better_Pages_With_Firebug" rel="nofollow noreferrer">Build Better Pages With Firebug</a></li> <li><a href="http://www.digitalmediaminute.com/screencast/firebug-js/" rel="nofollow noreferrer">Guite to JS Debugging using Firebug</a> (video)</li> </ul>
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    1. COgimme some free debugging, please.
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    2. COI changed the if and else clauses to do this instead: document.getElementByID(navid_array[i]).className = etc... It works! Thank you very much.
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    3. CO@NRNR: I know, I shouldn't just *give* Napoli the fish. I mostly said what's wrong with the original code because I was going to offer the more efficient, scalable alternative.
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