Coding Alternative Error Output 
The method of error output already explained (default.htm) is not very user-friendly because the message is displayed so far apart from the actual entry.
The following alternative method exists (second.htm page):
Syntax
<tr class="bspTbvCellStd"> <td>zwischen</td> <td><input type="text" name="time_from" value=" <% page->write( value = time_from ). %> " size="5"> <font color="red"> <%= page->messages->assert_message( 'time_from' ) %> </font></td> </tr>
In this case, the text belonging to the input field time_from is displayed directly after the input field. The method assert_message returns an error text for a condition (in this case, the attribute name), or an empty string if there is no error message for the condition. You can determine the severity of the error for a condition with assert_severity .