jQuery on click css3 rotation
<p>I need to get an image to rotate having its transform origin at 50% 50%. is the following correct? It does not seem to work for me.</p>

<pre><code>        function slideUp_Menu(){
                    $('.main_nav').slideUp('slow', function(){
                        $("#arrow_up").css({ "-webkit-transform": "rotate(180deg)" });
                        $("#arrow_up").css( "-webkit-transform-origin", "50% 50%");
                    });// $('.tab_wrapper').animate({ marginTop: '193px' }, 500, 'linear');
        }
</code></pre>
