[plugin: Archives for a category] using a custom field for cat id

Hi,

I am wanting to use a custom field for the category id to be pulled through for this plugin to work, but I am not sure how to structure the code to get it to work.

Any ideas anyone? custom field for the page is catid

This is what I have at the moment (I know it doesnt work).

<?php $catid = get_post_meta($post->ID, 'catid', true);
echo wp_get_archives('cat=.$catid&limit=10'); ?>

Thanks in advance!

Stacey