[support] tweaking php to get random images from multiple galleries

[will hall]

hi all, this is from the -> PHP snippets section of the drupal website: 
Customization and theming » PHP snippets » PHP block snippets
Random image from a particular category/gallery

can someone help tweak this so you can have it grab the images from 
several diferent galleries, rather than just one?

i'm very new to php, but i don't think adding several gallery names, 
separated by commas, will work...

thanks!

-- will

<?php
   $gallery_name='Enter the name of the gallery
here';
   $term = taxonomy_get_term_by_name($gallery_name);
   $tid = $term[0]->tid;
   $thumbs = 0;
   while ($thumbs<1) {
   $images = (image_get_random($count = 1, $tid));
   print l(image_display($images[0],
'thumbnail'),'node/'.$images[0]->nid, array(),
null, null, FALSE, TRUE);
   $thumbs++;
}
?>