Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.603
diff -u -r1.603 common.inc
--- includes/common.inc	21 Dec 2006 22:20:19 -0000	1.603
+++ includes/common.inc	26 Dec 2006 19:35:53 -0000
@@ -1218,7 +1218,7 @@
   if (is_array($attributes)) {
     $t = '';
     foreach ($attributes as $key => $value) {
-      $t .= " $key=".'"'. check_plain($value) .'"';
+      $t .= " $key=".'"'. check_plain(trim($value)) .'"';
     }
     return $t;
   }