So far, i have saved the page that was in the disk cache ( without the new thread buttton nor alternate text ).
I opened it with:
links 2 ( graphic mode ): there isn't an alternate text, but i can reach it ( there is a square that acts as a link ). Oh yes i tried with images disabled.
Mozilla Firebird 0.6: there is the alternate text "Post New Thread" ( strange ).
Mozilla 1.4: there is nothing, but i have found it with the mouse

.
With ctrl+i ( informations ) i see Post New Thread ( anchor ), but it's not displayed.
But i tried also to start apache and i put another forum page ( from another forum this time ) with a similar problem: when i turn off the images, i can't see some links.
In fact if i toggle the images ( block images from this site ) seems that also the alternate text ( sometimes it contains the link to another page ) is toggled.
A bug? ( anyway i'll try to look better at it )