title: <FORM> posting to <IFRAME> causes pop up window in IE7 only
body: <p>I'm construction a iframe and form with jQuery as such:</p>
  
  <pre><code>iframe = $("&lt;iframe&gt;", {name : "foo"});
  form = $("&lt;form&gt;", {
    target : $iframe.attr("name"),
    action : "/foobar",
    method : "POST"
  }).append($("&lt;input&gt;", {
    type  : "submit",
    name  : "amifully",
    value : "dressed"
  }).hide());
  $("body").append(iframe).append(form);
  form.submit();
  </code></pre>
  
  <p>For some reason, in Chrome/Safari/Firefox/IE8+ it works great but in IE7 it opens the form in a pop up window.</p>
  
  <p>Anyone have any idea what's going on?</p>