[jQuery] blockUI plugin fails in IE

[rmurp...@gmail.com]

I am trying to use blockUI to block the siblings of a div when the div
is in "edit" mode, i.e.:

<div class="modules">
  <div class="module" id="myDiv1" />
  <div class="module" id="myDiv2" />
  <div class="module" id="myDiv3" />
  ...
</div>

<script>
var $active_module = $('#myDiv1');
$active_module.siblings().block();
</script>

This works in FF3 just fine, but in IE I get an error: Unexpected call
to method or property access. The error points to jQuery itself, this
line inside the append method:

this.appendChild( elem );

I am running jQuery 1.3.2 and v2.10 of the blockUI plugin.