title: Jquery : Checkbox not getting checked in IE7
body: <p>I'm trying to check a checkbox, i've tried doing the following :-</p>
  
  <ol>
  <li><p><code>$('#someId').attr('checked','checked');</code>   </p></li>
  <li><p><code>$('#someId').attr('checked', true);</code></p></li>
  </ol>
  
  <p>both the above work for ie8,ff <strong>but not for ie7</strong>!! </p>
  
  <p>I'm using an older version of jquery (1.4.2) so using .prop() is not possible.</p>