style-sheet customisation

Hi,

I generate PDF from a docbook file, uses <example> parts and here is 
what it looks like:

Example 1.1. Here is an English example of a substitution drill:

Here is the docbook part:

<example>
   <title>Here is an English example of a substitution drill:</title>
      <itemizedlist>
          <listitem>
            <para>T: Are you an American?</para>
          </listitem>

	... other listitems

      </itemizedlist>
</example>

How can I get rid of the " Example 1.1." part ? I did this for the 
sections/chapters but could not find where I can do the same with the 
<example>

Thanks for your help

Eric