Thanks Andy, but where exactly should I insert the code in the templates?

Here is an example of a template, where should I enter the code?

<td valign="middle"><font face=Arial color="#000099"><b><strong class="title"> </strong></b></font> <font face=Arial><b><strong class="title"> <font color="#000099"> &nbsp;
<%title_linked%>
</font></strong></b></font>
<!-- Subcategories-->
<%if category%>
<font size="5">&nbsp; </font> </td>
</tr>