why doesnt my lightbox work? here is the code:

i have placed this in my HEAD tags

<link rel="stylesheet" href="components/com_foo/foo.css" type="text/css" media="screen" />

Code:
<script type="text/javascript" src="components/com_foo/js/prototype.js"></script>
<script type="text/javascript" src="components/com_foo/js/scriptaculous.js?load=effects,builder"></script>
<script type="text/javascript" src="components/com_foo/js/lightbox.js"></script>

and this is the code snippet that doesnt work

Code:
        $linkTarget = $mosConfig_live_site."/index.php?option=com_foo&page=show_ads&catid=$catid&adid=$row->id&Itemid=$Itemid";

        if($row->image_count > 0)
        {
            $rq = "SELECT thumb FROM #__foo_imagelist WHERE user_id = ‘$row->id’ ORDER BY id "
            ."LIMIT 1";
            $database->setQuery($rq);
            $image_name = $database->loadResult();
            $image_link = $mosConfig_absolute_path."/components/com_foo/images/tmb/".$image_name;
            if(file_exists($image_link))
           
                        {
                $image_set = "<a href=’components/com_foo/1.jpg’ rel=’lightbox’><img src=’".$mosConfig_live_site."/components/com_foo/images/tmb/".$image_name."’ align=’center’ border=’5′></a>";
            }
           
            else
            {
                $image_set = "<a href=".$linkTarget." rel=’lightbox’><img src=’".$mosConfig_live_site."/components/com_foo/images/system/nopic.gif’ align=’center’ border=’0′></a>";           
            }
        }