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    <p>How about a different approach: who cares about time? (You're not going to reliably sync the system clock with JavaScript.)</p> <p>Instead, use a <a href="http://nodejs.org" rel="noreferrer">Node</a> server with <a href="http://socket.io" rel="noreferrer">socket.io</a> to synchronize when your clients advance the slideshow. Instead of the clients deciding when to advance, the server tells them to.</p> <p>This approach comes with the added bonus of being able to manually fiddle with the slideshow while it's running. In the example that follows, I've added a <em>Next</em> button that causes all connected clients to immediately advance to the next slide.</p> <h1>app.js</h1> <pre><code>var express = require('express') , app = express.createServer() , io = require('socket.io').listen(app) , doT = require('dot') , slide = 0 , slides = [ 'http://placekitten.com/700/400?image=13', 'http://placekitten.com/700/400?image=14', 'http://placekitten.com/700/400?image=15', 'http://placekitten.com/700/400?image=16', 'http://placekitten.com/700/400?image=1', 'http://placekitten.com/700/400?image=2', 'http://placekitten.com/700/400?image=3', 'http://placekitten.com/700/400?image=4', 'http://placekitten.com/700/400?image=5', 'http://placekitten.com/700/400?image=6', 'http://placekitten.com/700/400?image=7', 'http://placekitten.com/700/400?image=8', 'http://placekitten.com/700/400?image=9', 'http://placekitten.com/700/400?image=10', 'http://placekitten.com/700/400?image=11', 'http://placekitten.com/700/400?image=12', ]; app.listen(70); // listen on port 70 app.register('.html', doT); // use doT to render templates app.set('view options', {layout:false}); // keep it simple doT.templateSettings.strip=false; // don't strip line endings from template file app.get('/', function(req, res) { res.render('index.html', { slide: slide, slides: slides }); }); app.post('/next', function(req, res) { next(); res.send(204); // No Content }); setInterval(next, 4000); // advance slides every 4 seconds function next() { if (++slide &gt;= slides.length) slide = 0; io.sockets.emit('slide', slide); } </code></pre> <h1>views/index.html</h1> <p>This file is processed as a <a href="http://olado.github.com/doT/" rel="noreferrer">doT</a> template.</p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Synchronized Slideshow&lt;/title&gt; &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"&gt;&lt;/script&gt; &lt;script src="/socket.io/socket.io.js"&gt;&lt;/script&gt; &lt;script&gt; var curslide = {{=it.slide}}; // the slide the server is currently on. $(function() { $('#slide' + curslide).css('left',0); $('#next').click(function() { $.post('/next'); }); }); var socket = io.connect('http://localhost:70'); socket.on('slide', function(slide) { $('#slide' + curslide).animate({left:-700}, 400); $('#slide' + slide).css('left',700).show().animate({left:0}, 400); curslide = slide; }); &lt;/script&gt; &lt;style&gt; #slideshow, .slide { width:700px; height:400px; overflow:hidden; position:relative; } .slide { position:absolute; top:0px; left:700px; } &lt;/style&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="slideshow"&gt; {{~it.slides :url:i}} &lt;div id="slide{{=i}}" class="slide"&gt;&lt;img src="{{=url}}"&gt;&lt;/div&gt; {{~}} &lt;/div&gt; &lt;button id="next"&gt;Next &amp;gt;&lt;/button&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Copy these two files into a folder, then run</p> <pre><code>$ npm install express socket.io dot $ node app.js </code></pre> <p>and navigate to <code>http://localhost:70</code> in several different windows, then see the magic.</p>
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    1. COLove this answer! Ignoring my question to get to the same objective. I'm going to take this approach and see what I can get out of it!
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    2. COAnd kudos for the demo link!
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