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    <p>First, no need to use the archaic <code>&lt;form&gt;</code> and posting of forms, when you are also using AJAX. So I removed all that. Makes it much simpler.</p> <p>Next, you need a way to store the value on the server, and to access it again later. One method is to use PHP Sessions (the $_SESSION variable).</p> <p>Note that I changed the name of your PHP processor file to <strong>your_php_file.php</strong>. Change it as you wish, but make sure to change it in all locations (filesystem, ajax1 and ajax2).</p> <p>Here is a working example that will do what you want.</p> <p>HTML and javascript/jQuery:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; $(document).ready(function() { if ($('body').width() &gt;= 960) { var sizeOfSlider = 500; } else { var sizeOfSlider = ($('body').width())/2; } $.ajax({ type: 'POST', url: 'your_php_file.php', data: 'hiddentrick=' +sizeOfSlider, dataType:'html', success: function(data) {alert(data);}, error: function(data) { //AJAX request not completed alert('error'); } }); $('#mybutt').click(function() { $.ajax({ type: 'POST', url: 'your_php_file.php', data: 'showss=yes', dataType:'html', success: function(data) { alert(data); $('#result').html(data); }, error: function(data) { //AJAX request not completed alert('error'); } }); }); }); //END $(document).ready() &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="result"&gt;&lt;?php echo $sizeofslider ?&gt;&lt;/div&gt; &lt;input type="button" id="mybutt" value="Show PHP var"/&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p><strong>your_php_file.php</strong></p> <pre><code>&lt;?php session_start(); if( isset($_POST) ){ if (isset($_POST['showss'])) { echo 'Hidden value: ' . $_SESSION['sos']; }else{ $sizeofslider = $_POST['hiddentrick']; $_SESSION['sos'] = $sizeofslider; echo $sizeofslider; } }else{ echo 'No POST data'; } </code></pre>
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    1. COIt's true, I need to send the variable back to the server before the php loads, and maybe $_SESSION will do that, though this is not the right way. $('#result').html(data); will write over <?php echo $sizeofslider ?> and post the correct result, but I won't be able to do calculations with $sizeofslider in the rest of my php.
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