[jQuery] How to trigger my modal window after 30 seconds?

[jQuery] How to trigger my modal window after 30 seconds?


Please excuse me, I'm a bit new to all of this. I'm trying to use
jqModal for my Lightbox-like newsletter signup. Right now it's being
triggered by a link. Instead, how do I trigger it after 30 seconds? It
would also be cool if I could make it not bother the same user more
than once... maybe a cookie or something?
Here's what I have so far, example 2 from http://dev.iceburg.net/jquery/jqModal/
--
$().ready(function() {
$('#ex2').jqm({ajax: 'examples/2.html', trigger: 'a.ex2trigger'});
});
--
<a href="#" class="ex2trigger">
...
<div class="jqmWindow" id="ex2">
Please wait... <img src="inc/busy.gif" alt="loading" />
</div>
--
Much obliged,
Kyrre