Only first div is curvy

Great plugin!

The only thing I come across this:

I've added this to my Drupal 6.3 setup:

jQuery CurvyCorners code to apply on all pages:

$(document).ready(function()
{
$('#textblock').corner();
})

The curvy corners are then only applied to the first DIV#textblock to come up in the html-output with this id. The remaining DIV's with the same id remain square...

How can I solve this?

Regards from 10o,
The Netherlands