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copied!<p>You must have comma separators between the array values when you define your array.</p> <p>You should also have two separate script elements, one for including jquery and the other for your code.</p> <p>The content of a script tag with a src-attribute should be ignored by most browsers.</p> <pre><code><script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" type="text/javascript" ></script> <script type="text/javascript"> var images = ['OUT01ari.jpg', 'OUT02adobe.jpg', 'OUT03alife.jpg', 'OUT04chinup.jpg', 'OUT05datenightwinecologne.jpg', 'OUT06officechair.jpg', 'OUT07printer.jpg', 'OUT08whitewall.jpg', 'OUT09umbrella.jpg', 'OUT10converse.jpg', 'OUT11wardrobebar.jpg']; $('#background').css({'background-image': 'url(images/' + images[Math.floor(Math.random() * images.length)] + ')'}); </script> </code></pre> <p><a href="http://www.w3.org/TR/html5/scripting-1.html">W3C 4.3 Scripting HTML5</a> says:</p> <blockquote> <p>If there is a src attribute, the element must be either empty or contain only script documentation that also matches script content restrictions.</p> </blockquote> <p>And the same is true for earlier versions I believe.</p> <p><strong>Edit:</strong></p> <p>If you are working on the local file system , make sure to change the URL to jQuery to <strong>http://</strong> instead of just <strong>//</strong>.</p> <p>Also, make sure your script is executed when the #background element exists by calling in on <a href="http://api.jquery.com/ready/">document ready</a>.</p> <p>This example should work even locally:</p> <pre><code><html> <head> <style type="text/css"> #background { position:fixed; left: 0px; top: 0px; background-size:100%; width:100%; height:100%; -webkit-user-select: none; -khtml-user-select: none; -moz-user-select: none; -o-user-select: none; user-select: none; z-index:9990; } </style> <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js" type="text/javascript" ></script> <script type="text/javascript"> $(function() { var images = ['OUT01ari.jpg', 'OUT02adobe.jpg', 'OUT03alife.jpg', 'OUT04chinup.jpg', 'OUT05datenightwinecologne.jpg', 'OUT06officechair.jpg', 'OUT07printer.jpg', 'OUT08whitewall.jpg', 'OUT09umbrella.jpg', 'OUT10converse.jpg', 'OUT11wardrobebar.jpg']; $('#background').css({'background-image': 'url(images/' + images[Math.floor(Math.random() * images.length)] + ')'}); }); </script> </head> <body> <div id="background"></div> <div class="container"> </div> </body> </html> </code></pre>

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