replace this line

<a href="<?php echo $slrow['url']?>" <?php echo ($slrow['urltype'] == "ext") ? "target=\"_blank\"" : "target=\"_self\"";?>><img src="<?php echo SITEURL;?>/plugins/jqueryslider/slides/<?php echo $slrow['filename']?>" alt="" title="#htmlcaption<?php echo $slrow['id']?>" /></a>

with

<a href="<?php echo $slrow['url']?>" <?php echo ($slrow['urltype'] == "ext") ? "target=\"_blank\"" : "target=\"_self\"";?>><img src="<?php echo SITEURL;?>/plugins/jqueryslider/slides/<?php echo $slrow['filename']?>" alt="" <?php if($conf['showcaption']):?>title="#htmlcaption<?php echo $slrow['id']?>"<?php else:?><?php endif;?> /></a>

This will hide the image title and description for the slider ,Thanks