Hi.

I guess the best and most trusted way to post and have photos online could be as „flickr“ or „Google Picasa“ You can even implement albums in your website from those sites, so i guess you have a solution #1:
http://www.flickr.com
http://picasa.google.com/

#2. You could use very nice Gallery web-software for FREE:
http://www.dezinerfolio.com/freebie/dfgallery-10
http://codex.gallery2.org/Gallery2:Installation_Requirements

#3. Any of popular open source (free) CMS (Content Management System) has a plugin or module or addon for gallery. And it's easy to use. Try out:
http://www.joomla.org
http://www.wordpress.org
.. or google for free cms.

So this is it.
P.S. I answered this questions as i understood. I don't understand much German so i translated it for + / - . Sorry if you ment something else :)