title: IE6 https security message appearing after closing jQuery colorbox overlay
body: <p>I am working on a secure site, https.</p>
  
  <p>I am using the colorbox jquery plugin to iframe another page from the same site over the current content.</p>
  
  <p>In IE6 when i close the colorbox overlay i get the following message:</p>
  
  <p>"This page contains both secure and nonsecure items.</p>
  
  <p>Do you want to display the nonsecure items?"</p>
  
  <p>Any ideas why this is happening?  Can it be prevented?</p>
  
  <p>Assume i would have to make the whole site http rather than https but this is not possible as we have online payments.</p>