title: window.open error only in IE - Invalid argument
body: <p>I have a simple calendar popup window come up when a date on the calendar is clicked. The code below works in Opera, FF and Chrome but not in IE6-8. It comes up with the <code>Error on Page</code> at the bottom and shows the error <code>invalid argument</code>.</p>
  
  <pre><code>&lt;div class="day-number"&gt;1&lt;/div&gt;
  &lt;td class="calendar-day" onclick="window.open('http://www.cal.com/admin/editevents.php?day=2&amp;month=4&amp;year=2011', 
  'Edit Events', 'scrollbars=1,width=600,height=475');"&gt;
  </code></pre>
  
  <p>Could someone help me out and spot what I'm doing right but wrong according to IE?</p>