Index: privatemsg.module
===================================================================
--- privatemsg.module	(revision 127)
+++ privatemsg.module	(working copy)
@@ -999,6 +999,6 @@
 }
 
 function privatemsg_privatemsg_pm_controls($pmid) {
-  return l(t('Delete message'), 'messages/delete/'. $pmid);
+  return l(t('Delete message'), 'messages/delete/'. $pmid, array('attributes' => array('class' => 'message-delete')));
 }