escaped & not validated correctly

validating a page by direct input (it's a private site, therefore no url!) I got
the following message:

> 
>  Error Line 64, Column 31: & did not start a character reference. (& probably
> should have been escaped as &.)
> 
>  http://www.kath-zeitz.de/?mm=1&amp;me=8</div>
> 
obviously there is no unescaped &.

That is the whole div containing the & in question:


<div class='text'>
<a class='imgB' href='?art=del&amp;file=datei1#focus
<view-source:http://martinschicketanz.de/admin/?art=del&file=datei1#focus>'><img
src='del.png <view-source:http://martinschicketanz.de/admin/del.png>' alt='del'
/></a>
<a class='imgB' href='?art=edit&amp;file=datei1#focus
<view-source:http://martinschicketanz.de/admin/?art=edit&file=datei1#focus>'><img
src='change.png <view-source:http://martinschicketanz.de/admin/change.png>'
alt='change' /></a>
Die Kreuzigung (John Stainer)<br />
http://www.kath-zeitz.de/?mm=1&amp;me=8</div>


Thank you for the validator. Best regards.

Markus Schicketanz