WYCSIWYG is now HTML…

Hey folks, i’ve got a little problem. The Internet Service Provider mutated my domain to an other server, that has PHP5 instead of version 4. This means Ninplay.nl now has PHP5, but the WYSIWYG editor doesn’t work. Instead, the writting panel only shows the HTML version, and not the WYSIWYG editor itself. Can somebody tell me what to do to fix this? Thanks in advance !!!