[jQuery] [SimpleModal] Modal dialogue not showing

[jQuery] [SimpleModal] Modal dialogue not showing


If I just do a simple:
$.modal("Test");
I can see via FireBug the modal gets added to the page. Here's the
HTML:
<div id="modalOverlay" class="modalOverlay" style="opacity: 0.5;
height: 100%; width: 100%; position: fixed; left: 0pt; top: 0pt; z-
index: 3000; display: block;"/>
<div id="modalContainer" class="modalContainer" style="position:
fixed; z-index: 3100; display: block;">
<a class="modalCloseImg modalClose" title="Close"/>
<div class="modalData" style="display: block;">Test</div>
</div>
But the modal is not displayed. In fact, if it wasn't for FireBug
there would be no indication SimpleModal loaded anything. Any idea
what's wrong? There are no errors or warnings in the console and
addign alerts to the SimpleModal .js shows me all the correct bits are
firing, right down to the .show() for the overlay, etc.
Richard