http://worgtsone.scienceontheweb.net/
In older scripts, I put the solutions into (losung) or (l) tags, who got
displayed or not by a switch in the upper right corner.
This works if you printout the pages from within firefox.
When exporting html to *whatever*, the content of (l) tags is displayed as well, and is a hell to erase.
So, instead, solutions must go into comment signs, then they are not exported.
So, instead, to add REAL comments, you must add them as js comments, see above.