Index: wp-admin/user-new.php
===================================================================
--- wp-admin/user-new.php	(revision 16065)
+++ wp-admin/user-new.php	(working copy)
@@ -262,9 +262,9 @@
 	</tr>
 	<?php } ?>
 </table>
-<p class="submit">
-	<input name="adduser" type="submit" id="addusersub" class="button-primary" value="<?php esc_attr_e('Add User') ?>" />
-</p>
+
+<?php submit_button( __( 'Add User '), 'primary', 'adduser', true, array( 'id' => 'addusersub' ) ); ?>
+
 </form>
 
 </div>