Index: wp-admin/includes/template.php
===================================================================
--- wp-admin/includes/template.php	(revision 16700)
+++ wp-admin/includes/template.php	(working copy)
@@ -546,7 +546,7 @@
 ?>
 </select>
 <input class="hide-if-js" type="text" id="metakeyinput" name="metakeyinput" tabindex="7" value="" />
-<a href="#postcustomstuff" class="hide-if-no-js" onclick="jQuery('#metakeyinput, #metakeyselect, #enternew, #cancelnew').toggle();return false;">
+<a href="#postcustomstuff" class="hide-if-no-js">
 <span id="enternew"><?php _e('Enter new'); ?></span>
 <span id="cancelnew" class="hidden"><?php _e('Cancel'); ?></span></a>
 <?php } else { ?>
Index: wp-admin/js/post.dev.js
===================================================================
--- wp-admin/js/post.dev.js	(revision 16700)
+++ wp-admin/js/post.dev.js	(working copy)
@@ -337,6 +337,11 @@
 			return s;
 		}
 		});
+		
+		$('a[href=#postcustomstuff]').click(function(e) {
+			$('#metakeyinput, #metakeyselect, #enternew, #cancelnew').toggle().focus();
+			return false;
+		});	
 	}
 
 	// submitdiv