"Ok, check your email now ;) Yes, we can help with advice but I don't really understand how can blind users access the forum? are you adding some kind of sound narrator software to it?"
Blind people can browse the web with an electronic grail (kind of like electronic grail books and Bibles), but it's virtually impossible to make a site compatible with them. It's not even worth trying - you can have a fully valid XHTML 1.0 Strict site with valid CSS and no images at all and it still wouldn't be fully compatible with an electronic grail. On top of that, the W3C WCA Guidlines are pretty much impossible to follow past Level 1.
Basic accessibility considerations should be using the alt attribute on all images, having HTML substitutes for Flash menus, and the use of CSS.
Other basic guidlines include:
* Not requiring users to have the Java plugin installed.
* Not requiring users to have Internet Explorer.
All of these are pretty easy guildlines to follow.