title: SimpleModal popup doesn't center until browser is resized
body: <p>I'm using the <a href="http://www.ericmmartin.com/projects/simplemodal/" rel="nofollow">SimpleModal</a> plugin to popup a post but it doesn't center horizontally until  the browser is re-sized. I set the top position to "0" but want it centered horizontally when called. Here is the function I use to activate it.</p>
  
  <pre><code>jQuery(document).ready(function() {
  jQuery('a.postpopup').live('click', function(){
              var id = jQuery(this).attr('rel');
      jQuery('&lt;div id="ajax-popup"&gt;&lt;/div&gt;').hide().appendTo('body').load('http://fameordie.com/ajax-handler/?id='+id).modal({
                 opacity:90,
             position: ["0%"],
                 overlayClose:true
              });
              return false;
   });
  });
  </code></pre>