<table>
       <tr>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/01.jpg" width="100" height="75" border="0" /><span><img src="collage/images/01.jpg" /></span></a></div></td>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/02.jpg" width="100" height="75" border="0" /><span><img src="collage/images/02.jpg" /></span></a></div></td>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/11.jpg" width="100" height="75" border="0" /><span><img src="collage/images/11.jpg" /></span></a></div></td>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/12.jpg" width="100" height="75" border="0" /><span><img src="collage/images/12.jpg" /></span></a></div></td>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/06.jpg" width="100" height="75" border="0" /><span><img src="collage/images/06.jpg" /></span></a></div></td>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/08.jpg" width="100" height="75" border="0" /><span><img src="collage/images/08.jpg" /></span></a></div></td>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/09.jpg" width="100" height="75" border="0" /><span><img src="collage/images/09.jpg" /></span></a></div></td>
         <td><div class="gallerycontainer"><a class="pb" href="#nogo" ><img src="collage/thumbnails/13.jpg" width="100" height="75" border="0" /><span><img src="collage/images/13.jpg" /></span></a></div></td>
       </tr>
       </table>

.gallerycontainer{ position: relative;}
.pb img         {border: 1px solid red;}
.pb:hover       {background-color: transparant;}
.pb:hover img   {border: 1px solid blue;}
.pb span        {position:absolute; background-color:lightyellow; padding:0px; left:-500px; border:3px solid #ffaa3c; visibility:hidden; color:black; text-decoration:none;}
.pb span img    {border-width: 0; padding: 2px; }
.pb:hover span  {visibility: visible; top: 50px; left: 0px; z-index: 250;}