Yes, you can insert a caption but you need to convert quotes and greater and less than symbols into their html entity equivalents.

For example:

<a href="images/image-4.jpg" rel="lightbox" title="&lt;a href=&quot;link.html&quot;&gt;my link&lt;/a&gt;">Image</a>

Open up the productdetails.ascx page located in the \desktopmodules\smith.buynow folder and go to line 172 and you will see the following lightbox code:

<a runat="server" id="myPicURL1" rel="lightbox[myGallery]" visible="false"><img runat="server" id="myPic1" alt="" border="0" src="" visible="false" /></a>

<a runat="server" id="myPicURL2" rel="lightbox[myGallery]" visible="false"><img runat="server" id="myPic2" alt="" border="0" src="" visible="false"/></a>
<a runat="server" id="myPicURL3" rel="lightbox[myGallery]" visible="false"><img runat="server" id="myPic3" alt="" border="0" src="" visible="false"/></a>
<a runat="server" id="myPicURL4" rel="lightbox[myGallery]" visible="false"><img runat="server" id="myPic4" alt="" border="0" src="" visible="false"/></a>
<a runat="server" id="myPicURL5" rel="lightbox[myGallery]" visible="false"><img runat="server" id="myPic5" alt="" border="0" src="" visible="false"/></a>

I took a look at the lightbox website http://www.huddletogether.com/projects/lightbox2/ and didnt see anything about printing. Try leaving them a message on their website and ask them the question about printing.

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At your service,
Dave Smith