Fuck! It does not seem to properly process some (but not all!) BiDi directives. the result is what you can (?) read here. May be mozilla's fault too.
Oh no. :-)
Update: Yes, must be Mozilla. Opera does not understand BiDi, apparently, and happily writes
Hello, שלומ, здрасте!
It also shows "strange" characters on both sides of the שלומ thing. Which means that Yudit must have put them there.