Sounds to me like you are looking for a mailing list manager, which is what I linked to you initially...
You could simply e-mail them all initially and ask them to go to X address hosted on your intranet to subscribe.
If it's something you update regularly, you should considering installing a fully fledged photogallery script to backend it, something along the lines of http://yapig.sourceforge.net/ would be fine, but there are literally countless other ones around the net, so hit up google and see what takes...
Ignore the previous post, it would appear I misread the question somewhat ;)
I don't believe there's a limit on session data, as it's stored server side and I can see nothing on changing the size limit in the PHP manual or in my PHP.INI - hope that helps.
I read in a book some time ago that cookies were limited to 20 per domain (by "the" browser??) and 4kb in size. I have no idea if this is true anymore or not, I am trying to look into it - but returned nothing as of yet.
I don't know what your setup is like, but just as a suggestion you could use a free DNS service to open up your computer to your clients/friends to look at your work. Apache is a web server afterall. Be aware of the security implications to this though.
Check out a service such as...
Take a look here: http://www.hotscripts.com/PHP/Scripts_and_Programs/Mailing_List_Managers/index.html
Would probably be your best bet if you don't know where to start in writing your own mailing list manager.
Try adding a doctype to your page...
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
That might do it.
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