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    <p>What if I told you you didn't have to use jQuery.animate at all to achieve the effect you want? Use <a href="https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Using_CSS_transitions" rel="nofollow">CSS3 transitions</a>! Here's a <a href="http://jsfiddle.net/XTm55/1/" rel="nofollow">forked version of your fiddle</a> showing how to accomplish what you're looking to do (I think) <em>(I've put the html/css/js at the bottom of this post as well)</em>.</p> <p>When the DOM content has loaded, the <code>alignItems</code> function makes sure that all images stay in the same place on the page. The script keeps track of the current image being displayed. Every time a different link is moused over, the image being displayed gets updated, such that the old current image gets its opacity set to 0 and the new current image gets its opacity set to 1. Then CSS transitions can be used to animate the opacity, which blows away <code>$.fn.animate</code>, but will only work on modern browsers (see <a href="http://caniuse.com/#search=css%20transition" rel="nofollow">caniuse</a>...motherf***ing IE -<em>_</em>- ). Code below:</p> <p><strong>html</strong></p> <pre><code>&lt;div class="menu"&gt; &lt;a href="#" data-image-id="1"&gt;link 1&lt;/a&gt; &lt;a href="#" data-image-id="2"&gt;link 2&lt;/a&gt; &lt;a href="#" data-image-id="3"&gt;link 3&lt;/a&gt; &lt;a href="#" data-image-id="4"&gt;link 4&lt;/a&gt; &lt;a href="#" data-image-id="5"&gt;link 5&lt;/a&gt; &lt;/div&gt; &lt;div id="container"&gt; &lt;img id="1" src="http://farm7.staticflickr.com/6092/6330704947_dd7e1b453c_t.jpg" /&gt; &lt;img id="2" src="http://farm1.staticflickr.com/13/15463218_8651d51b21_t.jpg"/&gt; &lt;img id="3" src="http://farm3.staticflickr.com/2570/4220856234_029e5b8348_t.jpg" /&gt; &lt;img id="4" src="http://farm4.staticflickr.com/3036/2975303180_86c4858b2b_t.jpg" /&gt; &lt;img id="5" src="http://farm7.staticflickr.com/6216/6240217938_aeed84634a_t.jpg" /&gt; &lt;/div&gt; </code></pre> <p><strong>css</strong></p> <pre><code>.menu a { padding: 2px 4px; color: #555; text-decoration: none; } .menu a:hover { color: #ddd; background: #333; } #container { margin-top: 10px; } #container img { margin: 4px; padding: 4px; border: 1px dashed #aaa; opacity: 0; -webkit-transition: opacity 500ms ease-in; -moz-transition: opacity 500ms ease-in; transition: opacity 500ms ease-in; } </code></pre> <p><strong>javascript</strong></p> <pre><code>$(document).ready(function () { alignImages(); var currentImgId = 0; $('.menu a').hover(function () { var oldImgId = currentImgId; currentImgId = this.dataset.imageId; $(document.getElementById(oldImgId)).css('opacity', 0); $(document.getElementById(currentImgId)).css('opacity', 1.0); }); }); function alignImages() { var $images = $('#container img'); var position = $images.eq(0).position(); $images.each(function() { this.style.position = 'absolute'; this.left = position.left; this.top = position.top; }); } </code></pre>
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    1. POCan I slow down this Javascript function?
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    1. CONote that this method will gracefully degrade for older browsers, there just won't be any animations. If animations are *absolutely necessary*, you could always fall back to jQuery's animate function.
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    2. COWhy are you doing `$(document.getElementById(oldImgId))` instead of `$('#' + oldImgId)`?
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    3. COI always pass in DOM elements to jQuery whenever I can. It bypasses having to use jQuery's Sizzle engine, which can be a huge performance crutch. Although Sizzle is smart enough to to bypass having to do a full parse of a selector string when it's a simple ID, there's no reason to initialize the engine at all when you're doing something this simple, and especially when it could be happening as rapidly as a user mousing over different elements. In fact, I would've liked to rewrite *all* of this code in plain vanilla JS but didn't want to deviate too much from the original question.
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