This bug exists in IE6 and IE7 and is caused by a JavaScript that tries to modify a tag that hasn't been closed (yet).

For example this one:

<div id="x">
  <script type="text/javascript">
  $('x').replace("wrong");
  </script>
</div>

This example fixes the problem, because the script is defined after the tag that it tries to modify:

<div id="x">
</div>
<script type="text/javascript">
  $('x').replace("correct");
</script>

See BUG: Error message when you visit a Web page or interact with a Web application in Internet Explorer: 'Operation aborted' for a detailed explanation of the problem.

<!--[if IE]><style>
.layout {
    height: 0;
    he\ight: auto;
    zoom: 1;
}
</style><![endif]-->