Problem theme is Prime Version: 2.0.1 by WPZOOM
DOM source shows the following. However, tooltip does not appear on mouseover.
<a href="http://site.url/wordpress/?glossary=messenger" title="Glossary: Messenger" onmouseover="tooltip.show('Somebody who delivers messages or small parcel.');" onmouseout="tooltip.hide();" class="glossaryLink">messenger</a>
The theme does call wp_head() in its header.php, as recommended in the readme file. Tooltip works great using other themes, Twenty Twelve Version: 1.1 and Venture Version: 1.0.2 by WPZOOM. No other plugins are installed.
Does anyone know where I should start looking for a solution?