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    <p>PHP is a preprocessor. So, it doesn't matter that you are including it 'later' in the file. Your include_once will be processed and output before the JavaScript is executed. </p> <p>I looks like the problem is that your include_once script is also outputting the container div. So, when you remove that line it breaks the javascript. Try this instead:</p> <ol> <li>Remove the container div from you maxresults.php file.</li> <li>Replace the <code>&lt;?php include_once('functions/maxresults.php);&gt;</code> with an empty div with an id of container: <code>&lt;div id="container"&gt;&lt;/div&gt;</code></li> </ol> <p>Your JavaScript should work now:</p> <pre><code>&lt;script type="text/javascript"&gt; $(document).ready(function() { $.ajax({ url: 'functions/maxresults.php', type: 'GET', data: {h: screen.height, w: screen.width} }).done(function(resp) { alert("I am working!"); $("#container").html(resp); }); }); &lt;/script&gt; </code></pre> <p><strong>And further down</strong></p> <pre><code>&lt;div =id="container"&gt;&lt;/div&gt; </code></pre> <p><strong>maxresults.php</strong></p> <pre><code>&lt;?php require_once("databasefunctions.php"); ?&gt; &lt;div id="movieinfo"&gt; &lt;?php include("sidebar.php");?&gt; &lt;?php // get the function include_once ('function.php'); if($_GET['page']) $page = $_GET['page']; else $page = 0; $maxresults = -1; if(($_GET['w']) &amp;&amp; ($_GET['h'])) { $w = $_GET['w']; $h = $_GET['h']; } if ($w == 1920) { $maxresults = 24; } else if ($w == 1600) { $maxresults = 21; } else if ($w == 1440){ $maxresults = 14; } else if ($w == 1366) { $maxresults = 21; } else if ($w == 1024) { $maxresults = 8; } else $maxresults = 6; echo $maxresults; $currentpage = $page; $page = $page*$maxresults; $numpages = QuickQuery("SELECT COUNT(id) FROM movies WHERE visible=1"); $numpages = mysql_result($numpages, 0); $numpages = $numpages/$maxresults-1; $result = GetMoviesByRangeID($page, $maxresults);//Show &lt;maxresults&gt; pages at a time DisplayResults($result); ?&gt; &lt;/div&gt; </code></pre>
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    1. POjavascript include_once- javascript php calling same file duplicating content
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    1. COthe correct dimensions are being outputted- the issue is that all of the content in "container" is being duplicated; shown first by the php (as you clarified) and second by the javascript.
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    2. COwhat exactly does maxresults output? is it creating the container element?
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    3. COyes, maxresults is creating the container element and all of the divs/content inside
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