JSFiddle - React, Tailwind, and code Playground

HTML

<div id="body">
<div class="photo">
<ul class="topic">
    <li><a class="set" href="#Portraits">Portraits<!--[if gte IE 7]><!--></a><!--<![endif]-->
    <!--[if lte IE 6]><table><tr><td><![endif]-->
        <ul>
            <li><a href="lbox/portrait1.jpg"><img src="http://www.cssplay.co.uk/menu/lbox/portrait1a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait2.jpg"><img src="lbox/portrait2a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait3.jpg"><img src="lbox/portrait3a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait4.jpg"><img src="lbox/portrait4a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait5.jpg"><img src="lbox/portrait5a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait6.jpg"><img src="lbox/portrait6a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait7.jpg"><img src="lbox/portrait7a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait8.jpg"><img src="lbox/portrait8a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait9.jpg"><img src="lbox/portrait9a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait10.jpg"><img src="lbox/portrait10a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait11.jpg"><img src="lbox/portrait11a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait12.jpg"><img src="lbox/portrait12a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait13.jpg"><img src="lbox/portrait13a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait14.jpg"><img src="lbox/portrait14a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait15.jpg"><img src="lbox/portrait15a.jpg" alt="" title="" /></a></li>
            <li><a href="lbox/portrait16.jpg"><img src="lbox/portrait16a.jpg" alt="" title="" /></a></li>
        </ul>
    <!--[if lte IE 6]></td></tr></table></a><![endif]-->
   ...

CSS

/* common styling */

#body a {color:#000;}
#body a:hover {text-decoration:none;}
#body a:visited {color:#000;}

/* slides styling */

#body .photo {width:635px; text-align:left; position:relative; margin:0 auto;}

#body .photo ul.topic {padding:0; margin:0; list-style:none; width:635px; height:auto; position:relative; }

#body .photo ul.topic li {display:block; width:125px; height:31px; float:left;}
#body .photo ul.topic li a.set {display:block; font-size:11px; width:124px; height:30px; text-align:center; line-height:30px; color:#000; text-decoration:none; border:1px solid #fff; border-width:1px 1px 0 0; background:#ccc; font-family:verdana, arial, sans-serif;}

#body .photo ul.topic li a ul, 
#body .photo ul.topic li ul 
{display:none;}

#body .photo ul.topic li.active a
{color:#000; background:#bbb;}

#body .photo ul.topic li a:hover,
#body .photo ul.topic li:hover a
{color:#fff; background:#aaa;}

#body .photo ul.topic li.active ul
{display:block; position:absolute; left:0; top:31px; list-style:none; padding:0; margin:0; height:375px; background:#ddd; width:464px; padding:40px 60px; border:20px solid #bbb; z-index:1;}

#body .photo ul.topic li a:hover ul, 
#body .photo ul.topic li:hover ul
{display:block; position:absolute; left:0; top:31px; list-style:none; padding:0; margin:0; height:375px; background:#ddd; width:464px; padding:40px 60px; border:20px solid #aaa; z-index:100;}

#body .photo ul.topic li ul li
{display:inline; width:112px; height:87px; float:left; border:1px solid #fff; margin:1px;}

#body .photo ul.topic li ul li a
{display:block; width:110px; height:85px; cursor:default; float:left; text-decoration:none; background:#444; border:1px solid #888;}

#body .photo ul.topic li ul li a img
{display:block; width:100px; height:75px; border:5px solid #eee;}

#body .photo ul.topic li a:hover ul li a:hover, 
#body .photo ul.topic li:hover ul li a:hover 
{white-space:normal; position:relative;}

#body .photo ul.topic li a:hover ul li a:hover img, 
#body...

JavaScript

$(document).ready(function(){
    $('ul.topic li a').click(function(){
        $('ul.topic li').removeClass('active');
        $(this).parent().addClass('active');
    alert('hi')
    })
})