Gigpress jQuery problem

I’m having trouble with the ‘toggle venue info’ link that’s supposed to reveal a few extra fields when you click on it.
It works in Firefox but not in IE7. Haven’t tested elsewhere.
It worked fine before the recent update.
I believe I’ve tracked down the problem to this bit of jQuery in the Gigpress.js file:

$gp(‘tr span.moreVenue’).show();
$gp(‘tbody#venueInfo’).hide();

$gp(‘tr span.moreVenue a’).click(function()
{
$gp(‘tbody#venueInfo’).toggle();
return false;
}
);