Basic question - effect doesn't do anything

Basic question - effect doesn't do anything


Hi,
I'm sure I'm forgetting something obvious, but for my life I can't
figure out what it is. Something really simple:
$('document').ready(function() {
$('.fx-pulsate').effect('pulsate')
}
Well, that code does nothing. Neither does:
$('.fx-pulsate').click(function(event) { $(this).effect('pulsate') })
If I put an alert instead of the effect, the alert is indeed shown on
click.
This baffles me :(
I'm using jQuery 1.3.1 and jQuery UI 1.5.3
I've been fiddling in Firebug and reading some docs, but nothing
obvious comes up.
I'd appreciate some help with this :)
- Ivan