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    <p>You don't need <code>Math.abs()</code> because <code>tpxl</code> will always be a positive number. To set the position of the div to be 100px from the current top of the window, use <code>$(window).scrollTop() + 100 + 'px'</code>.</p> <p>I don't really understand why you have the <code>if</code> / <code>else if</code> structure. The following would keep the div fixed at 100px all the time:</p> <pre><code>$(window).scroll(function () { $('#div').css('top', $(window).scrollTop() + 100 + 'px'); }).scroll(); </code></pre> <p>Demo: <a href="http://jsfiddle.net/G5BVU/" rel="nofollow">http://jsfiddle.net/G5BVU/</a></p> <p>To only set the position "fixed" when the scroll point is less than 100 or more than 700 like for your original code try this:</p> <pre><code>$(window).scroll(function () { var tpxl = $(window).scrollTop(); if (tpxl &lt; 100 || tpxl &gt; 700) { $('#div').css('top', tpxl + 100 + 'px'); } }).scroll(); </code></pre> <p>Demo: <a href="http://jsfiddle.net/G5BVU/1/" rel="nofollow">http://jsfiddle.net/G5BVU/1/</a></p> <p>EDIT: To have the element scroll normally except when the window is scrolled between those two points just reverse the <code>if</code> condition from my previous example:</p> <pre><code>if (tpxl &gt; 100 &amp;&amp; tpxl &lt; 700) $('#div').css('top', tpxl + 100 + 'px'); </code></pre> <p><a href="http://jsfiddle.net/G5BVU/2/" rel="nofollow">http://jsfiddle.net/G5BVU/2/</a></p> <p>In all cases provide an initial <code>top</code> setting as appropriate.</p>
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    1. POfixing elements whilst scrolling?
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    1. COI should have explained this better; I need the element to scroll with the rest of the elements until the window scroll distance gets to 100px, I then want the element to stay 100px from the top until the window scroll distance reaches 700px
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    2. COSee my update and final demo - it may not be quite what you're looking for, but I would hope it gives you enough of an idea to finish it yourself. Whatever you're doing you don't need to negate the value of `tpxl` or use `-Math.abs(tpxl)`.
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    3. COThis may be an issue with my browser/hardware, but the elements still jitter whilst scrolling
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