title: Strange image displayed under the like button
body: <p>on a site I created I have added a standard like function for advertisements users made.</p>
  
  <p>Whenever I use like on a product page it works fine, e.e. <a href="http://www.markt4art.nl/Advertenties/ToonProduct.php?A=101" rel="nofollow">http://www.markt4art.nl/Advertenties/ToonProduct.php?A=101</a> but on a Services page it shows a weird icon, e.g. <a href="http://www.markt4art.nl/Advertenties/ToonDienst.php?A=90" rel="nofollow">http://www.markt4art.nl/Advertenties/ToonDienst.php?A=90</a></p>
  
  <p>Even when I delete this image from my directory Facebook still show this weird and unwanted image.
  Please explain how I can fix this and (if applicable) how I can determine myself which image Facebook will use to make a thumbnail.</p>
  
  <p>This is a critical errors as all facebook likes are now very wrong...</p>
  
  <p>Thx for your help.</p>