CKEditor is deleting divs

My code looks like this:

<div class="contact">
      <p>Enquiries: Level 3, Martin Building</p>
      <p>9.00 am to 5.00 pm, Monday to Friday</p>
      <p>Tel: (03) 9479 1979</p>
      <p>Email: <a href="mailto:lmcourses@abc.edu.au">lmcourses@abc.edu.au</a></p>
      <p>Web: <a href="/lawman/">www.abc.edu.au/lawman/</a></p>
    </div>

But the divs get deleted if I edit the page using CKEditor.

<p>Enquiries: Level 3, Martin Building</p>
<p>9.00 am to 5.00 pm, Monday to Friday</p>
<p>Tel: (03) 9479 1979</p>
<p>Email: <a href="mailto:lmcourses@abc.edu.au">lmcourses@abc.edu.au</a></p>
<p>Web: <a href="/lawman/">www.abc.edu.au/lawman/</a></p>

Can anyone tell me what might be causing this?