[Plugin: Top Up Plus] Show thumbnails in a row

I’m using the Top Up Plus lightbox plugin on a site I’m working on and it works great except for one thing which seems like it should be easy to fix, I just don’t know how. I want the thumbnails of the video files to be in a row instead of on top of each other lik they are now. See this page.
I was told by the author of the plugin that I should be able to edit it in the line of code below but it just won’t work. Any help would be much appreciated!

$this->video['default']['target'] = '<a href="###EMBEDURL###" title="###TITLE###" class="top_up" toptions="type = flash, title = \'###TITLE###\', width = ###WIDTH###, height = ###HEIGHT###"><span class="tup_previewimage" style="width:###PREVIEWWIDTH###px;"><img src="###IMAGE###" width="###PREVIEWWIDTH###" height="###PREVIEWHEIGHT###" alt="###TITLE###" /><span class="tup_playbutton" style="left: ###LEFT###px; top: ###TOP###px;"> ▶ </span></span></a><br />';