I am doing it using the mouseover plugin this way :
in qa-mouseover-layer.php
find $q_list['qs'][$index]['title']='<SPAN TITLE="'.qa_html($text).'">'.@$question['title'].'</SPAN>';
and replace it with:
$q_list['qs'][$index]['content']='<p class="q-list-content">'.qa_html($text).'</p>';
there is another method using the q_item_title() function ( please see post :
http://www.question2answer.org/qa/11764
In both ways , question image is output as a BlobID=xxxxx
Thank you!