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    <p>The column div's a &amp; b you are prepending to the div images which means they are childern of that div not parents.</p> <p>If you change your selecotors when appending the figures from this</p> <pre><code>$(this).parent().$(".column_b").append(this); </code></pre> <p>To this, it will find the div's and start working</p> <pre><code>$(".column_b").append(this); </code></pre> <p>One more problem is that you are removing the figure element after you are appending it to another div. Appending removes the elment from it's current container and puts it in the new div so you do not need to remove it.</p> <p><strong>Edit</strong> I added in the if block to check the last image based on your pseudo code. For it to work i created a counter to keep track of how many time we iterate through the loop. </p> <pre><code>var counter = 1; </code></pre> <p>Your if block inside the figures loop </p> <pre><code>if(counter == $(figures).length ){ </code></pre> <p>Also i changed the figures loop to only get the children figures of the current images div.</p> <pre><code>var figures = $(this).children("figure"); $(figures).each(function() { </code></pre> <p>And instead of using</p> <pre><code>$(this).parent().children(".column_a") </code></pre> <p>You can use jquery's sibling() function like so</p> <pre><code>$(this).siblings(".column_a") </code></pre> <p>Here's a <a href="http://jsfiddle.net/matt9388/3qbE6/2/" rel="nofollow">fiddle</a> example and below is the code.</p> <pre><code>$(function(){ $('.images').each(function() { $(this).prepend('&lt;div class="test_div"&gt;&lt;/div&gt;'); $(this).prepend('&lt;div class="column_b"&gt;&lt;/div&gt;'); $(this).prepend('&lt;div class="column_a"&gt;&lt;/div&gt;'); var counter = 1; var figures = $(this).children("figure"); $(figures).each(function() { if(counter == $(figures).length ){ if (height_a &gt; height_b + $(this).height()) { $(this).siblings(".column_b").append(this); } else { $(this).parent().append(this); } } else { var height_a = $(this).siblings(".column_a").height(); var height_b = $(this).siblings(".column_b").height(); if (height_a &gt; height_b) { $(this).siblings(".column_b").append(this); } else { $(this).siblings(".column_a").append(this); } } counter++; }); }); }); </code></pre>
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    1. COThank you for this answer. I have learned the append() method also removes it from it's curent container. Only for assigning height_a and height_b I reasoned like: 'this' is the figure, so its parent is div.images and in there I search for .column_a; with you just declaring $('.column_a') it finds **every** .column_a, where I only want to find the column_a in this div.images. The reason is, I want more than one such div.images each with different figures to be arranged.
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    2. COI have found I should use .children(".column_a"). Now please my edit in the main question to answer how I could extend the function.
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    3. COI updated my post with your extended pseudo code. Hope that's what you were looking for.
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