when I view source of your page, the links to the CSS and JS files for power gallery are not correct.
this section of code:
<style type="text/css" media="all">
@import url("css/slimbox/slimbox.css");
@import url("css/common.css");
@import url("css/light.css");
</style>
<script type="text/javascript" src="js/mootools-core.js"></script>
<script type="text/javascript" src="js/mootools-more.js"></script>
<script type="text/javascript" src="js/slimbox.js"></script>
<script type="text/javascript" src="js/gallery.js"></script>
should be:
<style type="text/css" media="all">
@import url("gallery/css/slimbox/slimbox.css");
@import url("gallery/css/common.css");
@import url("gallery/css/light.css");
</style>
<script type="text/javascript" src="gallery/js/mootools-core.js"></script>
<script type="text/javascript" src="gallery/js/mootools-more.js"></script>
<script type="text/javascript" src="gallery/js/slimbox.js"></script>
<script type="text/javascript" src="gallery/galleries/grid_lightbox/js/gallery.js"></script>
also, power gallery uses the mootools package which will conflict with jquery.
you will need to remove the jquery script:
<script language="javascript" type="text/javascript" src="ScriptLibrary/jquery-latest.pack.js"></script>
this two are why the lightbox is not working.
For the tooltip, the code in the following file has not been commented:
gallery.js
change:
//tooltips
this.tips = new Tips(this.thumbs.images, {
className: 'pg-gl-tip',
offset: {'x': -125, 'y': 20}
});
to:
//tooltips
/* this.tips = new Tips(this.thumbs.images, {
className: 'pg-gl-tip',
offset: {'x': -125, 'y': 20}
});
*/