problem with empty tag

Hi, in my xsl file i have the following code:
<div id="sum-Description" class="left" ></div>
<div class="action"><a target="mesCollapses"><img 
src="images/icons/fieldset.close.gif" alt="fermer" title="fermer"/>    <span 
class="hidden">open/close</span></a></div>
Problem: in output i have

<div class="left" id="sum-Description"><div class="action"><a 
target="mesCollapses"><img title="fermer" alt="fermer" 
src="images/icons/fieldset.close.gif"/><span 
class="hidden">open/close</span></a></div></div>

if someone have an idea ...

K.L.Nikita