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copied!<p>You don't need to even use JQuery for this.</p> <p><a href="http://jsfiddle.net/24ba7/3/" rel="nofollow noreferrer">You just need CSS (click for live example):</a></p> <pre><code> #header { position:fixed; width:900px; height:100px; left: 50%; margin-left: -450px; } </code></pre> <p><a href="http://jsfiddle.net/24ba7/3/embedded/result/" rel="nofollow noreferrer">Fullscreen version.</a></p> <p>To explain this a bit, the negative margin is half of the width that you defined, because elements center on the page based on their top-left most point, so we compensate for that by moving it back half of the way.</p> <p>Fixed positioning defaults to being aligned to as far left and as far top as it will go, so <a href="https://stackoverflow.com/questions/2005954/center-element-with-positionfixed">centering a fixed element</a> requires a little massaging.</p> <p>But as you see this is a CSS solution, so unless you need to use JQuery, I would avoid it. It adds unnecessary overhead and complexity for something that can be done in pure CSS.</p> <hr/> <p><strong>JQUERY SOLUTION</strong></p> <p><a href="http://jsfiddle.net/24ba7/7/" rel="nofollow noreferrer">http://jsfiddle.net/24ba7/7/</a></p> <pre><code> if ($(window).scrollTop() > HeaderTop) { $('#header').css({ position: 'fixed', top: '0px', left:'50%', marginLeft: '-450px' }); </code></pre> <p>You can't use <code>auto</code> <code>margin</code> with <code>fixed</code> positioning, you need to use the margin fix that I suggested.</p>

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